Swipe (or use arrow keys / WASD) to slide every tile. Two equal tiles that collide merge into one with double the value.
Every day brings one challenge, identical for everyone: reach a tile within a move or time limit, play around stone cells, or chase a score.
The tiles that appear are the same for all players, so the same moves lead to the same board. Your first finish counts; afterwards you can practice freely.
A new puzzle unlocks at midnight UTC.