Swipe (Up, Down, Left, Right) to move the tiles. When two same number touch, they merge into one. After every swipe, a new tile will appear in a random empty spot on the board. Slide the cells to merge them, 4, 8, 16, 32 ... 64 ... 128 .. 256 .. 512 .. 1024 ..., when 2048 tile is created, you win!
When there is no empty spot on the board and no adjacent tiles with the same value, you lose the game.