Page "Mario Party 2" Paragraph 9
from
Wikipedia
If all 4 players have the same color panel, whether it's red or blue, a four player mini game begins.
If 2 players have a blue panel, and the other 2 have a red panel, then it's a two versus two mini game.
If one player has a blue panel, and the others have a red panel, or vice versa, then a one versus 3 mini game begins.
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