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learn by writing real Rust

Get fluent in Rust,
one challenge a day.

Bite-size challenges compiled by a real rustc in the cloud. No setup, no tutorials to skim - just the borrow checker, a failing test, and you.

Learn by practicePlayground
ring_buffer.rs▸ cargo test
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impl <T> Iterator for RingBuf<T> { type Item = T; fn next(&mut self) -> Option<T> { // yield oldest → newest, no alloc let item = self.buf[self.head]; Some(item) } }
4 passed0 failed · finished in 0.18s
the daily

Everyone solves the same puzzle today

A fresh, hand-picked challenge drops at midnight. Keep your streak, climb the daily board, and compare your solution with the rest of the cohort.

curriculum

6 tracks, first println! to async

Each track is an ordered run of challenges, so every new concept builds on the one you just earned. Start anywhere - we'll remember where you left off.

all 6 tracks
01track / beginner
popular

Rust Fundamentals

Master the basics of Rust programming language, from syntax to ownership concepts.

76 challenges~12.1hbeginner
ownershipsyntaxstdlib
start freshstart
02track / beginner

Control Flow

Learn how to control the flow of your Rust program using loops and conditional statements.

15 challenges~2.8hbeginner
ifmatchloops
start freshstart
03track / intermediate

Rust Standard Library

Explore the Rust Standard Library and learn how to use its powerful features.

55 challenges~9.7hintermediate
veciterstdlib
start freshstart
04track / intermediate
new

Fearless Concurrency

Learn how to run Rust code in parallel with threads, share state safely, and write async code with tokio.

25 challenges~5.5hintermediate
threadsasyncsync
start freshstart
05track / intermediate
locked

Mastering Option<T>

Learn how to use the Option<T> type to handle optional values in Rust.

0 challenges~0mintermediate
optionpatterns
coming soonlocked
06track / intermediate
locked

Mastering Result<T, E>

Learn how to use the Result<T, E> type to handle errors in Rust.

0 challenges~0mintermediate
resulterrors
coming soonlocked
leaderboard

This week's top rustaceans

XP resets every Monday. Solve the daily, clear a track, and climb - the top three wear the crown until the next reset.

full leaderboard
#RustaceanXP this week
how it works

Built on the real Rust toolchain

01

Real rustc, not a sandbox

Your code is compiled by the actual Rust toolchain in the cloud. The errors you see are the errors you'll fight in production - E0502 and all.

02

Tests, not vibes

Every challenge ships a hidden test suite. You're done when it's green - no guessing whether your Iterator actually yields the right order.

03

rust-analyzer in your browser

Flip it on in the editor for hover types, completions, go to definition and inline diagnostics. It's compiled to WebAssembly and runs right in your tab - nothing to install.

04

Streaks that compound

Show up daily and keep the flame going. A few minutes a day adds up, and the borrow checker gets less intimidating with every rep.

Your first challenge is already waiting.

A new challenge every day. No setup, no cargo install - open the editor and write a line of Rust.

Start today's challengeExplore the curriculum