Cosmic Coaster is a 2 vs. 2 mini-game that appears in Mario Party 3.
The characters will ride a roller coaster-type ride across the galaxy. The characters will come across asteroids and stars while they are riding the coaster. The objective of the mini-game is for the characters to work together as a team and make it across the finish line with their roller coaster. Along the way, the characters will encounter signs that contain the image of Bowser on it. The characters will be able to move their cart by moving it either to left or right with the control stick. If they hit one of Bowser's sign, then they will slow down and be stunned for a brief moment. The characters will be able to collect a few coins along the way, which will be added to their total amount at the end of the mini-game. The team that crosses the finish line first will win the mini-game. The mini-game also records the fastest time the character crosses the line.
- - Move
- The Ztar makes it's second appearance in a Mario Party game in this mini-game. It is seen right at the goal and turns into a regular star as soon the players reaches it.