Learn to actually code.A game that builds itself around you.
Every exercise is generated for where you are and machine-checked before you see it — so the feedback is real, never hand-wavy. Write Python below and watch it pass real tests. No signup. Right now.
The demo exercise is warming up — check back in a moment.
01
The tests decide, not vibes
Your code runs against real Python tests in your browser. Pass/fail is deterministic — the AI never grades you.
02
It adapts to you
Struggle on a concept and the game diagnoses why and builds targeted practice. Fly through and it moves you up.
03
Build real things
Capstone projects with a senior-engineer code review — the answer to tutorial hell. Ship a portfolio, not just streaks.
Your first working program is about 3 minutes away.
Start my pathFree tier is genuinely free — we gate AI help and fresh generation, never the content.