The Complete Rules of 2048

One simple principle: slide and merge.

2048 is a puzzle where you slide number tiles on a grid to merge matching values. Choose a direction, and every tile moves as far as it can that way.

While moving, if two tiles with the same number collide, they merge into one tile with double the value. However, a tile that has already merged once cannot merge again within the same move.

If the move actually shifts any tile, a new tile (a 2 or a 4) appears in an empty cell. Create the 2048 tile to win, and the game ends when no more moves are possible.