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 practice Playground

KMAJ

12,400 rustaceans practicing · 140 challenges · 1,200,000 submissions

ring_buffer.rs▸ cargo test

1 2 3 4 5 6 7 8

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.

The same card greets you in every track and track page - wherever you are, today's challenge is one click away.

curriculum

5 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.

01track / beginner

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

start freshstart

03track / intermediate

Rust Standard Library

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

55 challenges~9.7hintermediate

start freshstart

04track / 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

05track / 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

#RustaceanStreakXP 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

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 challenge Explore the curriculum