Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

📦

Ownership Survival

Moved or copied? mut or not? When is each value dropped? Say whether it compiles, and what it prints. Three misses and you're out.

💀 3 lifeives 🚫 no clock

▶ Log in to play

← Back to the arcade