Bowser's Gnarly Party

Bowser's Gnarly Party is a board located above a sea of lava; it is hosted by Koopa Kid in the game Mario Party 4. He built it in honor of Bowser's greatness and wanted the players to have fun in it – whether they wanted to or not. Here, Koopa Kids were everywhere, and were put in charge of the games and shops.

The main attractions here was the two stone bridges, and of course, Bowser. Every time a stone bridge was crossed, pieces of it crumbled off. When it was crossed three times, it totally collapsed, and a new one appeared in a different direction. Bowser was always on his platform somewhere on the board, waiting for a character to pass him (and changed his position every time a player got the Star from Koopa Kid). He did different things to players depending on what size they were. If a player got to him at normal size, he took away half their coins (but gave fifty coins to players that had none). If a player got to him while miniaturized, he used his fire breath to send them to the starting point in the middle of the board. If a player got to him in their mega form, he challenged them to one of two mini-games, either Bowser Wrestling or Panels of Doom. If the player lost, half their coins were taken away. Victory resulted in Bowser leaving the board until the next Star was taken. Also, every now and then, Bowser used his magic to make everyone miniaturized for that turn. Landing on ? Spaces was rare to see here, but was not advisable anyway, for landing on one made the Bowser head statue in front fry the player in blue flames, which destroyed one of their items.

The Item Mini-Game of the board involved a Koopa Kid with three boxes. He put an item in each of them then shuffled them around. After that, the player chooses one of them. However, they didn't get the prize of the one they choose, that box instead becomes locked. After eliminating 2 boxes, Koopa Kid gave the item in the remaining box to the player. The Coin Mini-Game involved a Bullet Bill. Koopa Kid shot one at the player, and they surprisingly had the power to hold it back with only your hands. Tapping A repeatedly slowed it down. They got high amounts of coins if the speeding bullet didn't go far, and not too many if it covered a good distance.

In Story Mode, if the player beat their opponents on the board, Bowser challenged them to a Minigame in order to win his present. Success here allowed players to play Bowser's Gnarly Party in Party Mode.