Mario Golf
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This is a fantastic game.  The 1-player mode has many fun challenges, the later courses are amazing, and it's a pretty great golf game.  I use Yoshi.

Mario Party (1):
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The first is still my favorite.  I love the boards, especially Wario's Battle Canyon, and Peach's Birthday Cake.   Mushroom Mix-Up and Bumper Balls are amazing mini-games.

The New Tetris
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I got a high score on Spring!

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For multiplayer:
Stack, Pistols.
Complex, Rockets.
Basement, Grenade Launchers.
All License to Kill.
No Oddjob.

For single player, try to beat the facility in the 007 time!