Turn every light off in as few moves as you can. Today's board is fixed for the day—solve it, protect your streak, then share your result.
Short rules. Real thinking. Most rounds take 2–8 minutes.
Each tap changes a cross of lights. Can you make the whole board dark?
Connect 1 to the final number, one neighboring cell at a time.
Take 1, 3 or 4 stones. Beat the computer by controlling the losing positions.
Use constraints and elimination to uncover the only possible answer.
Reach a target on a looping clock using the fewest allowed jumps.
Read the sequence, find what changes, and predict what comes next.
The original KUBBU collection is still here.
KUBBU is a free online puzzle game platform designed by Ryan Cai. Play daily brain games, logic puzzles, number puzzles, spatial challenges and strategy games. No download or account is required—pick a puzzle, build your streak and come back for a fresh challenge.