Rust is a programming language. We write instructions in a text file; the compiler checks and transforms that code into an executable program.
2
In this program, fn main() marks the entry point. Curly braces { } surround the instructions. No need to memorize the symbols: look for the message in quotes.
3
println! displays a line of text. Quotes delimit the message in the code; they do not appear in the output. Compare the two cards, then reveal the result.
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YOUR MISSION
Distinguish the code we write from the text a program displays.
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Your file for this lesson
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Save to my GitHub
Choose an authorized personal repository. Each upload creates a new file in an activity folder; existing content is preserved. You decide whether to use one repository or different destinations.
Hello! I’m Rullstpetbot, Rullst Academy’s robot crab. Let’s find your next step. Choose a hint below.Reviewed guidanceAI answer · check the lessonYouReference material supplied to the tutorPreparing an explanation…Answer available in the conversation.Conversation cleared from this page.AI is available. Reviewed hints are also here.Reviewed guidance is ready. AI chat is not connected in this environment yet.In this version, child or restricted accounts use guided help. AI chat requires an adult account with confirmed email.Use reviewed guidance. To chat with AI when available, sign in with an adult account and confirmed email.Help for this lesson follows your account permissions and progress. You can use “Explore the Academy” meanwhile.Read the notice and check the option before sending to AI.The usage limit has been reached. Continue with reviewed hints and try again later.I couldn't get an answer now. Your question is still in the field; use reviewed guidance or try later.Use a short question of up to 400 characters, without personal data.ExpandBack to panelChoose a track in the catalog and start with its first lesson. Read the goal, try the activity and check the feedback. Journeys suggest entry points; appearance does not define ability. Sign in to save progress. Child accounts follow guardian controls. After completing a track, check its downloadable material: some projects use Rust/Rullst and others are activity workbooks. Each download's README explains its format. Visit the learner guide to explore the features.Here we use reviewed mission hints, without sending messages to AI.One more hintReview the last hintGive me a hintExplore Rullst Academy
Let’s work it out togetherTry it out. Create an account to save achievements.Loading your journey…Couldn't connect right now. Your answer is still here. Try again to save.We couldn't save right now. Try again in a moment.Too many attempts in a short time. Wait a few minutes and try again.Use a nickname of 3 to 24 unaccented letters, numbers or _.Use at least 10 characters. If it's very long, shorten to at most 72 bytes (accented letters may use more than one).The passwords need to match.That nickname is already in use. Choose another or sign in.We couldn't match those details. Check your login details and password or code.Nickname3 to 24 unaccented letters, numbers or _.Email or nicknameUse your account email or login nickname. Learners without an email use their nickname.Open Rullst Academy at its configured address and try again.Review the exercise values and try again.Complete the previous lesson to save this discovery. You can already read the explanation.Sign inCreate accountRecover accessPasswordWell done! Let's understand what you discovered.This achievement is already saved. Reviewing is part of learning too!First play: tap an answer. Then choose what the app did.Choose a title of 3 to 40 characters and think: did you change the text or the computer?Count the four stars slowly. The game compares your choice with the answer we stored.Look for /jogar. The route connects that path to the game's response.Let's do it together: use 2 correct answers and 5 points per answer. Count 5 + 5. Write 10 for the total.For a correct answer, celebrate. For an incorrect one, invite another try.Think of the player: first they see the question, then answer, and last see the result.Use a title of at least 3 characters, a question of 6 or more and two different options. Test both answers, predict the scores and answer the server review question.You did it! 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Here, you can experiment, make mistakes, try again and discover what you can do. You don't need to know everything to begin: just take the first step, at your own pace.
Sign in using the method you chose when registering, choose a nickname in your profile and find your first lesson. We'll celebrate each discovery with you.Welcome to Rullst Academy!Your account is private and supervised by your guardian. They can see progress, limit activities and help with your password. You can also view, download or delete your data.I read the notice above and authorize the described data use for teaching and supervision. I know how to withdraw this authorization.These controls affect saved account activities. Open content can be read without signing in. Saving controls renews retention for 365 days. Deleting the account withdraws authorization and erases its data.A legal guardian creates and supervises each minor's account. The learner uses a nickname, without their own email, public profile, leaderboard or messaging. We do not request documents or photos. Email confirmation protects access; it does not prove age or parenthood.Initial limit of eight learner accounts per guardian.Rullst quiz: last permitted lesson (1 to 8)Before creating an account: we will store nickname, age group, country, language, protected password, activities, progress and your guardian link for teaching and supervision. Oracle hosts this data in Brazil; Resend emails only adults and stores content and logs in the US. We do not sell data or use ads. You can review, export, pause learning data collection or withdraw consent by deleting the learner's account here. Child accounts without activity or control renewal for 365 days are deleted. Backups expire within 14 days and reapply deletions on restore.Pause account activitiesYour guardian paused account activities or limited lessons. Talk to them to continue.Receive Family confirmationRetained untilFamily: learning with guidanceI am this learner's legal guardian and have authority to authorize this account.For a minor's account, ask your parent or legal guardian to sign into their own account and open Family. Do not enter your details here.Wait at least 10 minutes after confirming your email before requesting the additional Family confirmation. This is a Rullst Academy measure, not a legal time limit.Under reviewRullst explorerThis option is for older accounts that received a recovery code. Use your login nickname and the code you saved. Accounts created with an email should use an email recovery link.I have an older recovery codeUse an already linked sign-in or your email and password to continue your journey.I still need to confirm my emailNew passwordI read the privacy notice. My email will be used for access, security and essential account messages.Read the notice and confirm the required declarations.Object to processingPassword changed. Sign in with your new password.Public profiles and leaderboards are available only to adults with confirmed email and no processing restriction.Learning records are paused by a privacy restriction. Manage this in your account.Choose your nickname and how you’d like to appear. Your profile stays private until you decide to publish it.ReceivedRefreshCreate your account, then choose a nickname in your profile.Describe your requestRequest received. Keep the reference and check below for updates.Restrict processingEnabling this pauses new learning records and hides your profile and leaderboard entry. You can still access, export or delete data and submit requests. Disabling it does not republish your profile.Restrict use of my dataRequest correction, object, appeal a response or make a complaint. Do not send documents, passwords or sensitive data. Track the reply here; our initial response target is 15 days, subject to the applicable legal deadline. You may also contact the controller or your country's authority.You already have five pending requests. Wait for a response or use the privacy contact.Your privacy requestsStay connected with RullstChange saved.Submit requestSend recovery linkSend email confirmationUsing a supervised learner account? Ask your guardian to reset your password in their account's Family area.Under 13Use my saved codeSmall steps. Big discoveries.Email confirmed! Now sign in with Google, GitHub or email and password, using the method you registered with. Email confirmation does not sign you in automatically.Choose my profile nicknameYour next chapter starts hereThe world needs your ideas.We’re glad you’re here. This is your space to discover, experiment and create.You don’t need to know everything to begin. A question, a little curiosity and the courage to try are enough. Every small step counts here, including the ones you take again. Learn at your own pace, celebrate your discoveries and bring your imagination to life.Choose a nickname in your user profile whenever you like. Your profile starts private; sharing achievements and joining the ranking are your choices.A space that feels like youConfirm your email before signing in. If the address is eligible for registration, you’ll receive a link. Check your spam folder too. Already have an account? Sign in or request a password reset.Read the welcome againWith care, Rullst. Let’s create together.WelcomeYour nickname and profileYour space for discoveryAnswers drafted in this browser. Only a confirmed completion records progress.Back to the catalogChoose an available card to begin. Each track has its own page and lesson sequence.Track achievementYou completed every activity in this track. This learning achievement is not a professional certification.One idea at a time: understand, experiment and check your prediction.Complete trackClear this lesson’s draftDelete this lesson’s editor draft from this browser and return to the starting material? Download anything you want to keep first.Draft removed from this browser. The starting material is back in the editor.The draft changed in another tab. Your edits were kept here without replacing the other version. Download this version before reloading or continuing in another tab.The browser could not save the draft. Download your file before leaving; confirmed account progress is separate.Your text will be saved in this browser when you edit it. On a shared computer, clear your drafts when finished.Your draft from this browser was restored. Review it before uploading.Draft saved in this browser. This does not mean it was uploaded to GitHub.As a visitor, this draft belongs to the browser and will not transfer to an account. Download a copy before signing in or creating an account.Download the track’s final projectAvailable after completing the track. The ZIP contains the project files; your edits in this space remain in the edited file.Direct upload accepts up to 8 KiB of text in one file. Use downloads and the manual guide for projects with multiple files.The example may be only a snippet or outline. Changing the extension does not make it a complete program. The activity ZIP contains starting material; the edited-file button downloads your text.What I understood:
My example or practice plan (use fictional data):
How I checked the result:
A question or next step:
My learning recordThe quiz ZIP uses the last creation completed and saved to your account. Unchecked form changes or edits in this editor do not change that ZIP.Choose a scenarioMini experimentLearning simulation: compare cards and check your predictions. The browser is not compiling Rust or starting a server.This scenario’s resultShow resultYour guardian needs to enable this track in My account. Existing achievements remain saved.Other tracks the learner may practiceNew tracks start disabled. The general pause applies to all. Limits control account activities and progress; public text remains accessible.Rullst quiz: last permitted lesson (1 to 8)Try the first lesson of each track. Sign in or create an account to save progress and continue.From first discoveries to advanced projects. Explore mathematics, programming and new ideas with Rust and Rullst. Learn, experiment and create at your own pace.Your snippet in progressanswers preparedBuild your answers and check when you are ready.Discovery workshopMove cards with the arrows and check your sequence.lessonsFor curious people, even without prior interest in programming. Observe, compare and explain decisions using fictional situations.Investigative mindInvestigate claims, plan fair tests and check sources. Finish by assembling your own investigation.Download investigation workbookAn editable Markdown guide for applying questions, tests, records and revision outside Rullst Academy. Use safe situations and fictional data.Separate observation, preference and hypothesis.Plan tests and check the limits of evidence.Build a workbook for your own investigation.Idea detective22 lessons availableChoose a track and move at your own pace. Each has its own sequence, practice and achievement; you do not need to finish another track before starting.Direct uploads require an adult account with confirmed email and linked GitHub. Downloads remain available according to activity access.Choose a destination and check its path and visibility before confirming.I reviewed the code, destination and visibility. I want to upload this file.GitHub denied access or requested a pause. Check permissions and try again later.Destination repositoryDownload my edited fileDownload started. Check your downloads folder; GitHub upload is separate.Edit the example or record what you learned. This space does not run code or grade answers. The draft is saved only in this browser, separately per account; you choose when to download or upload to GitHub.The file already exists or the branch rejected the upload. Check the repository; nothing was overwritten. For a new version, edit the text and review again.Choose an authorized personal repository. Each upload creates a new file in an activity folder; existing content is preserved. You decide whether to use one repository or different destinations.The upload could not be completed. Check the repository and try again. The Rullst Academy does not replace existing files.File formatAuthorize the GitHub App on your linked personal account, selecting repositories and the contents permission. Then load again.Authorize repositories on GitHubLink GitHub in My account before loading repositories.Load my repositoriesRemember a repository per trackLoad more repositoriesThe connection did not confirm the result. Check GitHub or retry without editing the text; the same attempt does not create another copy.Create a repository on GitHubNo personal repositories are available on this page. Create one with a README and select it in the installation, or load the next page when available.One repository for all activitiesOpen my file on GitHubHow I want to organizeIf you authorize activity uploads, the GitHub App accesses only repositories selected during installation. The Rullst Academy checks the linked GitHub ID, its installation and the repository list to validate the destination. After your confirmation, it sends the reviewed text to a new file in the selected repository. The text and installation tokens are not stored in the Rullst Academy database. Destination preferences stay in this browser, separately per account, and can be removed with Clear local data. Deleting a Rullst Academy account does not delete files on GitHub; manage files and revoke the installation on GitHub itself. The editor draft also stays in this browser, separately per account and lesson. It does not follow you to another device; download a copy and clear drafts on shared computers.PrivatePublic: anyone can view itFile saved to GitHub. Open the link to inspect your commit.Upload file to GitHubUse up to 8 KB of text per upload. For larger projects, download the materials and upload manually.My code or notesSave to my GitHubDirect uploads are not available yet. You can download your file and follow the manual publishing guide.The repository visibility changed. Load it again and review before uploading.Your file for this lessonReview this trackFor anyone who wants to understand how a page works, starting from zero. Activities use small examples; reading the full code can come later.Idea gardener with RullstFollow a visit between browser and server, discover HTML and connect two pages. Then take your idea garden to your computer.Download my Rullst gardenA two-page Rullst 12 project, translated README and tests. Install Rust to run locally; the initial setup downloads dependencies.Understand the roles of Rust, Rullst and the browser.Connect routes, HTML structure and clear links.Check two pages, inserted text and a 404 error.Rullst: a page comes aliveFor anyone starting with clicks and their own quiz. No programming experience needed. To meet the tools first, try the introductory Rullst track.Turn a question into an interactive quiz.Experiment with answers, decisions and scoring.Take home a Rullst project with your quiz choices.For anyone who has never programmed or wants a gentle fresh start. No installation needed for the lessons. A trusted person can help with reading.First sparks in RustLight up a terminal, discover what quotes change and turn errors into clues. Your final mission: an explorer card built in Rust.Download my first Rust projectA terminal explorer card with instructions in your language. No external dependencies; requires Rust installed to run on your computer.Distinguish code, text and terminal output.Read names and calculations, using errors as clues.Prepare a Cargo project and check two cases.Rust: first sparksFor anyone wanting to practice code in small steps. This track introduces syntax; if everything still feels new, start with Rust: first sparks.Rust program builderValues, decisions, loops, functions, borrowing and Option. Build a scoring station and take home a runnable Rust project.Download Rust projectA Rust terminal program, without a framework. Includes comments in your language, a README and tests. The first track’s quiz project uses Rullst 12.Read values, conditions, loops and functions.Experiment with borrowing and absence using Option.Build and test a scoring station.Rust: from idea to programStart this trackTry the first lesson without an account. Sign in to save your achievements.Is this track for you?Your path, step by stepWhat you will discoverThe time is an estimate, not a deadline. Take breaks, use hints and try again whenever you need.There is still something to investigate. Use the hint and try again.Lesson completed and progress saved to your account.You changed the answer. Check again to validate this version.My files and GitHubChecking your access to this lesson…The editor and downloads open when this lesson is available to your account. Check access below or return to the track map.Every lesson can become your own record: code, notes or a practice plan. Saving a file to GitHub is optional and does not change your XP.Ready to check your answer.Read the feedback before trying again.Your tracksOne world, five territoriesDiscovery, Foundations, Building, Specialization and Frontiers represent depth. You advance through learning, with the support you need.Track completedChoose your route and learning space. Explore free tracks with reading support, three visual styles and saved progress.In the Aurora Expedition, we face the dragons of problems and ignorance with questions, knowledge and creativity. Mistakes give us clues for the next attempt.Dragons are the challenges.Explore this trackFind a starting point and choose the setting for your journey.What will you discover next?With JavaScript disabled, all suggestions appear below. Track links remain available.My routeI prefer to explore allExplore • imagine • discoverAsk • experiment • testBuild • understand • go deeper{done} of {total} lessonsProgress has not loaded yet. You can still explore the tracks.Reading supportIn lessons, Listen uses voices available on your device. You can also share reading with someone.Suggestions to exploreRemember choices in this browserNo completed lessons at this stop.Your spaceChoices apply on this page only.Reference stageThis choice recommends content. It does not report or change account age or grant permissions.The preference could not be saved. Your choice applies on this page; check browser storage permissions.Changing routes preserves your achievements. You can return here whenever you like.Current space: Adventure — rounded shapes, illustrations and gentle motion.Current space: Laboratory — a grid background, technical details and moderately rounded shapes.Current space: Studio — straighter lines, a clean background and less decorative motion.Space updated. Your achievements stay with you.Choices reset. Explore at your own pace.Your choices stay in this browser. They do not change your account or family permissions.Sign in to keep achievements. You can try the first lesson of each track without an account.18+ · Develop skillsAges 15–17 · Build my futureAges 5–7 · Discover through playAges 12–14 · Try different pathsAges 8–11 · Create and investigateIn upcoming advanced work, we will practice clear requirements, reviewing suggested code, failure tests and explained decisions. Learning to use AI includes knowing how to check the result.Learn with AI, check with evidenceAll possibilitiesShow suggestionsStudy available foundationsAll learning programsDiscover what people create at workA career path combines foundations, work tasks, projects and assessment. Today you can study the published foundations and explore the full plan.Careers in the age of AICareer pathsExplore careersConnect skills to professional tasks, original projects and practical assessment. Roadmaps show available stages and what is still needed.How would you like to explore?Choose a skill, explore a career or discover upcoming specializations. See what you can already study at Rullst Academy.Explore learning programsA discovery can become a projectA first experience for youIn preparationSign in to see the progress you have already earned.Develop skills through your own projectsBuild projects for your futureShall we discover what we can create?Try a field and find your pathYour ideas can come to lifeExplore development, security, AI, data and cloud. Each path shows what you can study now and what we are preparing.From your first ideas to professional projectsYour knowledge may go beyond the suggestion. Adventure, Laboratory and Studio styles remain independent.Start from scratch, build on what you have studied or deepen your knowledge. The roadmap shows available foundations and upcoming professional preparation.Connect foundations, original projects and professional skills. Develop autonomy gradually, with support in activities that need guidance.With an adult, choose a discovery. Observe, play and explain by pointing or drawing. The first activities need shared reading.Discover different fields through projects and see the full roadmap. Experiment before choosing where to go deeper.Try creating, investigating and caring for the digital world. Discover professions through small projects, with support when you need it.Your progress has not loaded yet.Editorial review: 2026-09-26. Source: a 2025 global employer survey; not a country- or language-specific job listing analysis or a hiring promise.Read the WEF reportSoftware, AI and data, networks and cybersecurity feature in the WEF skills and jobs growth outlook for 2030. Our first career path builds on the Rust and Rullst foundations already published.Why learn these skills?Other planned specializations: AI application security and Rust performance. Each path will have its own prerequisites, projects and assessment criteria.Learning programsFoundations available · career path in developmentView the roadmapPlanned · lessons not yet availablePost-quantum cryptographyA future security specialization: study quantum-resistant cryptography, inventory and migration. These algorithms can run on ordinary computers; this differs from programming quantum circuits.Explore the professional goal too{done} of {total} lessons completedThis shows progress in available tracks. Completing these foundations does not complete milestones in preparation or award professional certification.The project we want to help you buildGoal of the complete career path, still in preparation. You can start with the published foundations and build at your own pace.Quantum computingStart with the available mathematics and probability foundations. The quantum path is still being planned.Explore mathematics foundationsAn initial discovery of bits, qubits and measurement, followed by mathematical foundations and small simulated circuits. Advanced study will cover algorithms, noise and limitations.Your learning roadmapThe tracks below are available to study. Each milestone also shows the deeper work still needed to complete the career path.Your progress in published foundationsSkill pathsExplore skillsLearn a skill such as Rust, SQL, Git or critical thinking. Use these foundations across different careers.SpecializationsSee upcoming specializationsGo deeper into a subject after building the required foundations. The new paths below are being planned.Choose a reference for suggestions. It does not declare your age or change account permissions.Start with this discoveryAdjust my journey and styleWhat would you like to learn to build?Different ways to learnChoose an option and use colors in #RRGGBB format.CardsYour adventure starts with youChoose your characterChoose your character to begin1. Choose a class and an appearance2. Give your adventure its colorsEvery class can explore every track. This is a visual choice: it changes neither XP nor difficulty. Outfits and equipment are fixed. Your character does not need to resemble you.CompletedA colossal dark-scaled dragon with biomechanical wings, AI sensors and laser emitters above a citadel in the clouds.Defeat the dragons of ignorance and problems.Investigate a question, test an idea and solve a challenge. Each discovery opens a new path.Customize characterExplore the world mapEye colorOpen eye color pickerFaceFace 1 · European inspirationFace 2 · Asian inspirationFace 3 · African inspirationHair colorChoose hair colorUse the picker or type # followed by six characters from 0–9 or A–F. Example: #AF795B. Imaginary colors are welcome too!In progressOne editor, two styles to explore. Choose your character, customize and save when ready.Customize your characterChildren's adventureCloseChoose a children's adventure characterEnlarge portraitLittle explorerYoung explorerBrown-skinned girl with a long braid and orange backpack, holding a notebook and magnifying glass beside a geometric leaf.Magnifying glass in hand, questions in a notebook. The world has clues waiting for you.Does one leaf look like another? The explorer observes, sketches and compares before deciding. Every good question opens a new path.Observe · ask · discoverEast Asian boy with black hair, an orange backpack, a magnifying glass and an open notebook in a futuristic garden.Magnifying glass in hand, questions in a notebook. The world has clues waiting for you.He found an unusual seed in the garden. Before deciding what it is, he observes its shape, sketches it and compares it with others. A good question can open up a great adventure.Observe · ask · discoverFeminineChoose a face and customize skin, eyes and hair. Original colors are always available.Little guardianYoung guardianBlack girl with short coiled hair and an orange scarf, holding a small glowing bridge model.Courage also means asking for help, welcoming someone and finding a solution together.A bridge should work for the people crossing it. The guardian listens to the group, tests paths and helps everyone take part in the discovery.Care · collaborate · connectBrown-skinned child with wavy hair, a hearing aid and a green jacket, offering a hand and holding a small glowing bridge.Courage also means asking for help, welcoming someone and finding a solution together.The crew wants to cross a stream. He invites everyone to draw a bridge and tests a small model with his friends. Each person contributes in their own way. Together, they find a safe path.Care · collaborate · connectChoose a character, try its appearances and colors, and save your choice.Little inventorYoung inventorBoy with curly auburn hair and glasses, using a wheelchair and holding a robot crab on his lap.An idea, a few parts and lots of curiosity. Every attempt reveals something new!A wheel and a claw can respond to commands. Our inventor tests one change at a time and explains his discoveries so everyone can build together.Imagine · build · tryBlack girl with curly hair, safety goggles on her forehead and a light jacket, holding an orange and green robot crab.An idea, a few parts and lots of curiosity. Every attempt reveals something new!She built a robot crab to explore the garden. When it heads the wrong way, they observe, change one part and try again. Learning also means discovering what can still be improved.Imagine · build · tryMasculineYour character joins you in your account and on the map. Appearance does not change your lessons or permissions.Original colorsPresentationChoose this characterMeet the characterLittle heroes, big discoveriesMagicMage · feminineMage · masculineImagine what does not exist yetAdventure mapTravel through gardens, workshops and cities of the future. Each stop is a real Rullst Academy track. Choose a region or use the filters to find your next mission.The path suggests an order, not an obligation. Setup tracks for different systems are alternatives. Planned regions do not have available lessons yet.A world to discover. One step at a time.To exploreMagic, science and courage meet to discover technology. Choose your character and join our robot crab across islands of knowledge — from your first ideas to new worlds.Every great adventure begins with a choice.Character previewYour character is saved to your account. It appears on your public profile only if you enable that option in profile settings.{done} of {total} lessons completedCity of MakersGardens of DiscoveryIdea WorkshopsStellar HorizonsCitadel of KnowledgeRegions of knowledgeDiscard changesChanges discarded. Your saved character was preserved.This account is restricted. Changes are unavailable.Save my characterCharacter saved to your account. The adventure continues!Saving character…ScienceScientist · feminineScientist · masculineTurn questions into discoveriesTry the options. Sign in to save your character.Skin colorOpen skin color pickerLittle Inventors: child characters. Aura Masters: teen and adult characters. Explore the styles and save your favorite.Character stylesSwitch appearanceUse the arrow to switch between feminine and masculine, and the Face menu to explore each class's portraits. You can change your hero and colors whenever you like.Aura MastersLittle InventorsPreview updated. Save to keep it in your account.Track presentationChecking your account…WarriorWarrior · feminineWarrior · masculineMeet challenges with creativityHere, curiosity becomes discovery and every attempt helps you grow. Our robot crab has prepared the path. Choose who will accompany your journey, at your pace and in your colors.Rullst universe · Aurora expeditionYour journey companion
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Rullst Academy