Mario Speedwagons is a 4-player mini-game found in Mario Party 4. Each player starts out in a customized racing car. The goal is the be the first one to cross the finish line. Along the way, the car's gears will need to shift as it picks up speed. This is indicated by the gea numbers flashing in the bottom-right corner. However, correct timing is needed, as shifting too fast or too slow will result in a decrease in speed or no increase in speed, respectively.
Controls
R button - Accelerate
A button - Switch gears
Name
The name of the mini-game is a pun on the name of the American rock band REO Speedwagon.