The player can see two doors. One leads to Bowser, and the other leads to two other doors. The player should see how many doors they can open before Bowser ends their game. The minigame has no time limit. Only when the player selects the door where Bowser is found does the game automatically finish.
Investigations from emulators reveal that it does not matter which door the player chooses. If the game decides they can go through into the next room, both doors will lead to the next room. If the game decides the player will fail, then Bowser will be behind both doors.