What Are Some Wii or Xbox Games That Have a 2nd Player Cooperative Mode Like Super Mario Galaxy 2?

That's pretty much it… my wife likes to play video games with me, but she doesn't really like the competitive aspects of multiplayer games. Super Mario Galaxy 2 was perfect, because she had a role that could really help me out. Anything similar to that?

Suggestion:

I know Toki Tori for the WiiWare (downloadable game) has something like that, where the second player helps out with the puzzles by drawing on the screen and the game is 900 wii points.

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