Pacman

Screen shot

Just like Pong and Tetris, almost every programmer has done a Pacman game at one time or other. This is mine. I myself find it pretty difficult to complete it, since there are so many dots. Note that this game runs in Super VGA 640x480 under DOS. For that, your video card needs to support the VESA/VBE 1.2 standard. Most modern cards do, however.