On to #7 and #6
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#7. Super Monkey Ball 2
A simple concept of rolling a ball from point A to point B, mixed with the theme of monkeys, makes one totally awesome game. Monkey Ball 2 has some pretty creative stages and characters that add some extra flare to the games. Also, this game has some pretty fun mini-games that you can play, like billiards and bowling, which gives the game extra replay value. I also like how you can record several stages you do to show off your skills. However, the problem with this game is that a lot of the later stages become really hard, and start to require more luck then skill. Overall the game is still a blast to play, especially if you are playing with others.
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#6. Mario Party 7
Ever have more then 4 friend over and feel like the only way you can play is by taking turns? Well, MP7 corrects that problem. With up to 8 players your friends and family can join in on the fun without having to leave anyone out. The inclusion of the mic was also a good one as it added some more unique was to play. The mini-games were also some of the best introduced in the MP series. However, the fact that it is only a party game prevents it from ranking higher.
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Were getting closer to #1 :D