Tunnel of Lava!

Tunnel of Lava! is a single-player Bowser minigame found in Mario Party 7. Its name is a pun on the carnival ride "Tunnel of Love."

Introduction
A Mechakoopa eats a key, then runs off into a door. Moments later, a large group of Mechakoopas emerges from the door.

Gameplay
The player must jump on the Mechakoopas to find the one that swallowed the key. The Mechakoopas constantly rotate in a circle and move in and out; occasionally, they will turn red and breathe fire, and touching the Mechakoopas or their flames will stun the player temporarily. If the player finds the correct Mechakoopa within 30 seconds, they win.

Controls

 * – Move
 * – Jump

In-game text

 * Rules – "Only one of Bowser's minions has the precious door key. Stomp on them to find it."
 * Advice – "Needless to say, fire is really, really painful. Avoid the critters when they are belching flame."