Squares

Two players take turns connecting two adjacent dots with lines on the playing field. If a player completes the frame of a 1x1 box, he earns one point and can (and should) draw another line.
Once all the dots are connected, the player with the most points wins.
Using the traffic light the strength level of the opponent (easy, normal or hard) can be controlled.
Field sizes from 3x3 up to 8x8 boxes are supported.