From the Super Mario Wiki
The Bowser Hideout is a location in Mario Party Advance. It is situated in the Jungle Area of Shroom City, but it can only be accessed through Bowser's Pipe House. It serves as a hidden base of sorts with Bowser, and it is decorated accordingly. It has gray, cracked walls around its interior accented by a purple trim and a large purple door. Bowser's throne is also largely purple, with blue accents and a red cushion. At the center of the hideout is a green table with a deck of cards on it. One of Bowser's quests, Boss Bowser, starts here once Bowser challenges the player to a card game. The card game is played on the aforementioned table and involves the player guessing if the next card is either higher or lower than the one currently drawn. If beaten, Bowser then challenges the player to the Bowser minigame Koopa Kappa, and succeeding at the minigame awards the player with two Gaddgets: Faux Flame and Hourglass.
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