Connect4

Connect4 is a game for your iPhone where the goal is to get four dots in a row before your opponent.

Difficulty level 1 provides a pretty good opponent. Difficulty 9 provides an outstanding opponent. Be warned though, the higher level you choose, the more time the computer takes to think. At level 6-7 it is only a few seconds on an iPhone 4, but level 8 may take up to 20 seconds, and level 9 may take up to 70 seconds. On older devices it will of course be even slower.