They might not have sold two million copies in their first week, but these games definitely deserve your dollar.

Cubivore
$34.99 Used at GameStop
In case you couldn’t tell from the title, the screenshot, and the proceeding text, this game is all about cubes. I could talk about it myself, but I’ll let Jonny “I Employ the Fabulous Karl Castaneda" Metts talk for me, via a snippet from his 2002 review:
It’s not just the graphics that are weird, but really the whole game’s sense of style and gameplay philosophy are simultaneously old-school and art nouveau.
Speaking of weird games, try doing battle by clapping your hands and beating a pair of bongos.