Editing Which Door Has More?

The area of play takes place in a building with many rooms and doors. On the floor, multiple kinds of species appear, with signs on top of the doorways dependent on what kind of species appear. The objective of the minigame is to gather as many coins as possible under the time limit. To accomplish this, the player must determine which of the species present on the floor is of greater quantity. Selecting the correct door advances the player to a hallway where they are able to collect coins, with members of the species cheering them on. Selecting an incorrect door does not award coins, as indicated by the dark and empty hallway. Most rooms offer only two types of species; however, during "[[Red Coin]] Chances", there are three types of species that are present. Selecting the correct door in this case offers Red Coins which are worth three times the amount of standard coins. In addition, coins will occasionally appear scattered throughout the room for the player to collect. During this minigame, item boxes spawn directly in front of the doors of the room in which they are activated, and using a [[Coin Bag (Mario Party: Star Rush)|Coin Bag]] item causes five Red Coins to appear in the same area.

Which Door Has More? is divided into three levels of difficulty. The first level takes place with red-colored walls, with more limited coins than later levels. Level two takes place with green-colored walls; several pillars block the view of the player, making it harder to see all the species easily. In addition, Red Coins appear on the floor of some rooms. The third level takes place with green-colored walls, where the light only comes from the pillars, and said light occasionally can turn off.

In the Koopathlon mode, this minigame is played while competing against other players, one level at a time. In the Free Play mode, the minigame is played individually, with all three levels played in a row with items limited to the Coin Bag and [[Double Medal]]. The objective of the Free Play variant is to simply obtain the most coins in a single game. In-between levels of Free Play mode, the player is given the opportunity to finish the last room of the previous level before starting the next level. The player's high score, if excessing either the current score or the default score of 30 coins, is recorded and can be compared with other top player's scores online in the Party Plaza. Obtaining at least 300 coins in a single game in the Free Play mode unlocks the "Eye for Detail" achievement.

{{footnote|note|2|The color of Koopa Paratroopa is green for level 1 and red for level 2. They are absent in level 3.}}

''Choose the door with the character there's most of to earn coins. The bonus rooms have three doors, but are worth more coins!'' (Free play description)