Smallball in Changeland
Smallball in Changeland is a fast-paced arcade-game where you have to gather as much points as possible as quickly as possible. It was designed to have that "Just once more"-feeling which turned out quite well. There is also some very catchy music and some cool interactive backgrounds which a screenshot cannot do justice to. Have a try, it's much more fun than it looks.
Pentium 2 or equivalent processor.