Ninja: Shadow of Darkness
Toy Story 2: The Game
101 Dalmatians: The Game (THIS GAME MADE ME RAGE SO HARD)
SkiFree
Star Wars: Episode 1: The Phantom Menace: The Video Game
Ninja Gaiden
Spider-Man
Spider-Man 2: Enter Electro
Spider-Man (Game Boy Color)
As far as I know not many people played these games.
[Edited on 10.05.2012 1:50 PM PDT]
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Lego Racing and Spider-Man for the N64, those were pretty damn fun. Does Sonic Heroes count as obscure? I remember renting that game and being addicted to it for a while.