A player starts with two tiles, each with a value of 1 and 2. Moves are made by the player moving the tiles in one direction - up, down, left or right - and all the tiles on the board move in that direction. Each move adds a new tile to the board, and the goal is to combine tiles with the same values to create higher values. For example, tiles with values 1 and 2 are combined into a tile with a value of 3, two tiles with a value of 3 are combined into a tile with a value of 6, and so on. However, the number 3 or higher can only be combined with the same numbers. For example, you have to combine the number 3 with the number 3 or the number 6 with the number 6. So, only in the initial move is it possible to combine 1 and 2.
The game continues until the player runs out of moves, which happens when the board is full and there is no room for new tiles, or when no more tiles can be combined on the board. The final score of the game is the sum of the values of all tiles on the board. The game is very easy to learn, but can be challenging and depends on the player's strategy.
