From the Super Mario Wiki
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The Extras Zone is a tent in Mario Party 8 where players can play one of eight minigames with either Mario characters or Miis that they've created on the Wii's Mii Channel or by using the default guest Miis. Initially, only four of eight minigames are available. The other four need to be purchased in the Fun Bazaar in order to unlock them. Up to four players can play in this mode, but some minigames only allows up to two players to play.
Extras Zone minigames