Like math puzzle games like 2048? In these games you double the value of a tile by adding it to another tile of the same number. Doubling these tiles until you hit the target goal (2048 in most of them).
Double Me This follows this similar pattern of games like Threes and 2048 by allowing tiles to be combines to form new tiles.
There is also a challenge mode that adds an additional twist of throwing a random tile onto the board every so many seconds during play. This makes it much more challenging because you are not controlling the position or movement.