"iGipf for iPhone/iPad" a combination of strategy and outrageous fun.

The premise is quite simple. Each player starts out with a set number of tokens. They take turns placing those tokens on the edge of a trig-gridded, hexagonal board. Pieces already on the board are pushed ahead as the new pieces enter from behind so that there is only ever one piece on each intersection. Game is lost by the player who runs out of pieces first, but there is a catch. When four or more pieces of a single color are aligned in a row, the player gets to remove those pieces from the board and recycle them. He also gets to remove any of his opponent’s pieces from the board if they are in the same line as his own pieces that he removes. In this way, players can "capture their opponents’ pieces and take them out of play.

The rules are very straightforward, but the strategies are complex and almost infinite.