Swap - a free game about switch app for iPhone and iPad
An amazing difficult puzzle game that forces you to think before every tap.You have to change every "X" to "O".When all tiles are changed to "O",you pass that level!Sounds simple but difficult.
How to play:
Tap a tile to invert the symbol of that tile and all of the adjacent tiles. The goal is to make all of the tiles with "O".
Now,compete with players around the world to get the least number of taps on each of the 100+ levels!