Bowser's Gnarly Party

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Bowser's Gnarly Party is Bowser's unlockable board in Mario Party 4. It can only be unlocked by completing Story Mode. Obviously, as the name implies, it is a Bowser-themed board. Koopa Kid appears to host this board, which is quite apparent since it is themed around Bowser.

Bowser will be standing somewhere on the board, waiting for a character to pass him. When you do, a different result awaits you if you're normal, mini, or giant. If your normal, prepare to get pounded! If you're mini, you'll get scorched away to an abandon area of the map. If you're giant, you will play a game of Bowser Wrestling!

There is an on-board mini-game called "Stop Bullet Bill" which you can only play while mini. In this game, a Bullet Bill will be shot at you, and you surprisingly have the power to hold it back with only your hands. Tapping A repeatedly slows it down, so press A really fast! You get high amounts of coins if the speeding bullet didn't go far, and not too many if it covered a good distance.

After you complete this board, you will challenge Bowser in The Final Battle! That is your chance to get your last present.