The player is sitting in place in their robot as the lava waves crash behind them.
The player, with three hearts as health, has to use the titular vehicle to drive around obstacles such as lava, rocks, and bridges (only in Free Play) to outrun the crashing lava waves approaching from behind. If the player goes over some leftover lava, they lose a heart, and the speed on the vehicle decreases. There are some health kits on the ground that heal the player by one or two hearts.
In Shroom City, the player wins by reaching the goal. In Free Play, the player can score by outrunning the crashing lava waves for as long as possible before being caught.
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