The goal of the game is to merge numbers together in order to reach the 1024, 2048, 4096, 8192 tile!
At the beginning of the game, you have one square (also called tile) with a 2 number inside.
When you make 2 tiles with the same number inside join, they merge into a new one with a number that is the addition of the 2 previous one : 2+2=4, 4+4=8, ..... !
To move the tiles on the grid, swipe with your finger to the desired direction (top, right, bottom or left). All the tiles moves to the choosen direction, until they merge with a tile having the same number or are blocked by a tile with a different number.