Cartman and his friends from South Park takes part in a Japanese game show, Mega Millionaire!, with the chance to earn large amounts of money (at least that's what they think before looking up the currency rates). The show which is considered highly dangerous, lets the contestants, wearing roller blades, rush through obstacle courses. The goal of each course is simple: reach the goal, while grabbing as many yen bills as possible.
The game takes place on a board with each square of the board representing an event. The player moves the boys across the board and plays through the events one after the other. There are also special squares, which allows the player to spin on the wheel of misfortune. By doing this extra conditions are added to the following stage.
The actual gameplay of the events consists of side scrolling platforming. The controls are simple: the player can move left or right and jump. Due to the roller blades the boys don't stop automatically but has to use the brake button. Each event has different obstacles, like the floor being full of greasy peanut butter, pools of water (and other liquid substances), sumo wrestlers and men in rabbit suits. In addition to the bills, each event also has three yen tokens, which if all collected gives massive bonuses to the player.
In addition to playing through all the events in the right order in the story mode, there is also an option for quick play where all completed events are available for play at any time. It's also possible to unlock another mode, the Hurry Run mode. This is done by picking up all tokens from all the events. The objective of this mode is simply to reach the goal as quickly as possible. The game's multiplayer mode allows up to four players play on the same phone by taking turns on the game board.