Successfully complete Star Battle mode with any character to unlock Bowser's Warp Orbit.
Successfully complete Star Battle mode with any character to unlock Blooper or Hammer Bro. Successfully complete Star Battle mode a second time with a different character to unlock the other character you did not unlock the first time through.
Successfully complete Star Battle mode to unlock the Mini-game Wagon, which allows you to buy mini-games.
Unlock one 4 player, 1 vs. 3, 2 vs. 2, and Duel mini-game to unlock the Crown Showdown mini-game.
Unlock one 4 player mini-game to unlock the Flip Out Frenzy mini-game.
Unlock Test For The Best mode in the Fun Bazaar to unlock the Test For The Best mini-game.
Unlock one Duel mini-game to unlock the Tic Tac Drop mini-game.
Trade the indicated number of Carnival Cards at the Fun Bazaar to unlock the corresponding bonus:
When you get a Twice Candy or a Thrice Candy, try to get all of the dice blocks the same number to get a nice coin bonus as a reward.
As the target you are aiming for gets to about the 9 o'clock position, or slightly after, throw the dart. If timed perfectly, you will hit what you are aiming for.
Serve the ball, then hit it at the last possible moment. If done correctly, this will result in an ace.
When you select "Battle Royale" in the Party Tent, the number of Carnival Cards you receive at the end of the game is two times the number of turns you played. For example, 10 turns results in 20 Carnival Cards, 20 turns results in 40 Carnival Cards, 30 turns results in 60 Carnival Cards, and so on.
Select Mario and he will do various things, ranging from falling down to jumping in the air.