SIXTY is a free daily speed math game. You get sixty seconds to solve as many problems as you can — addition, subtraction, multiplication, division — with a fresh set every day. No login, no ads, no account. Bring your mental math game.
Sixty is part of killpipe brain games: six free workouts you can finish in under four minutes total. Keep a daily streak going to sharpen the skill that calculus, personal finance, and split-second decisions all depend on.