Challenge someone who is online right now — or send a 1-tap WhatsApp battle link to any friend. Each 90-second match mixes predict-the-output cards with fix-the-bug cards where you choose the error — four options every time, no playground or code execution in the arena.
Players online now
⚡ Instant Friend Duel · No Waiting for Lobby
Challenge a friend on WhatsApp (15-min open room link)
Nobody online from your college yet? Send a 1-tap battle link — the moment your friend taps Accept, your 90-second 1v1 Python match starts live.
Pick a level for the battles you start — the invited player sees it before accepting. Cards are either output checks or fix-the-bug error checks; both use four quick choices. A level with too few published problems is greyed out, so an accepted invite can never dead-end.
A battle invite only lands while the other player has PyDebug open — the green dot means they are here right now. Offline players show no dot and their invite button stays switched off.
Looking for players…