List of minigames in Mario Party 9
 Free-for-All Minigames
There are a total of 44 Free-for-All minigames. These games can be played with two, three, or four players.
 1-vs-Rivals Minigames
There are a total of 10 1-vs-Rivals minigames. They can also be played with three players instead of four, turning them into 1-vs-2 minigames.
 Bowser Jr. Minigames
There are a total of 10 Bowser Jr. Minigames. All of them involve two players only.
 Boss Minigames
There are a total of 14 Boss Minigames. They can be played with two, three, or four players. The amount of health that each boss will have is dependent on how many players are playing; if four players participate, the boss will have more health than if only two players participate.
Note: Diddy's Banana Blast and DK's Banana Bonus aren't actually boss minigames, since they don't appear in Boss Rush. They are categorized under boss minigames in Free Play, however.
 Extra Minigames
These minigames can only be played in Extra Mode. The amount of players that can participate can vary for each minigame.