Anyone like shooters? If so, then give BossInABox a try.
"Most shooters make you suffer through waves of useless drones until you reach the big baddie at the end. Who needs that kind of button-jamming foreplay? BossInABox is one long frustratingly tough boss fight. If that doesn't scare you away, enjoy the challenge. Move the crosshair around the cube's exterior. As you blast the boss to bits, multiple Mini-Mes spawn in to make your life miserable!"
Go to http://www.digipen.edu/GameGallery/websites/BossInABox/index.html for some gameplay movies and screenshots, and of course, the download.
Hope you survive the challenge!! :-)