Three focused questions, about two minutes total — then you're done until tomorrow. Think Wordle, but the puzzle is "does this Python do what you think it does?"
No lobby, no menu-hunting — open the app and you already know what's coming.
Complete the line so the program does what it's supposed to.
Read the snippet and know exactly what it does before you run it.
One line is off. You get three looks — a wrong tap crosses that line out and tells you it was fine, instead of ending the question.
One attempt a day — today locks the moment you finish. No grinding, no doom-scrolling.
Every answer comes with the reason, so you actually learn why — not just whether.
Data structures, algorithms and runtime — the instincts interviews and code review both lean on.
Earn XP, hold your streak, and see how you stack up against friends and the world.
Follows your phone by default, or pick a side and stay there.
Play as a guest from the very first second — no sign-up, no email, no ads. Sign in later only if you want your streak to follow you to a new phone.
Free on the App Store. Light or dark, whichever your phone is wearing.
Download on the App Store