Jurassic Park: Operation Genesis. [XBOX. Great game.]
Mario Kart: Double Trouble. [Gamecube, good game too, only for multiplayer though.]
Grand Theft Auto: Vice City. [PS2, I whore the weapons cheat on this game.]
i remember it took me a while just to beat one of the bosses on that game, just never had good enough attack cards..got there in the end though..erm..at the moment..still battling through N3(ninety nine nights) every so often, getting there now.
Load in your completed save game and pray at the Collosi statues in the starting area, it tells you that when you finish the game and also unlock hard mode (different unloackables for hard mode time attack).