Crate Burning

Crate Burning is a mini-game playable in Super Mario Galaxy 2, along with Ball Rolling. As the name implies, it involves Fire Mario or Fire Luigi burning the Crates on the arena. The mini-games can only be played in Rightside Down Galaxy in the mission "The Great Crate Incinerator", and Upside Dizzy Galaxy in the mission "Burning Upside Dizzy". The objective of the mini-game is to use the Fire Flower abilities (the effects last for the entire mini-game) to burn all the crates on the arena (a similar arena to the Bob-omb Blasting mini-games from the first game) within the time limit of 20 seconds. If all of the crates are burned before the 20 seconds are up, the Gearmo rewards Mario or Luigi with a Power Star. Losing the mini-game doesn't result in losing a life.

Trivia

 * Interestingly, the mini-games are only found in gravity-altering-based galaxies. This is paralel to Super Mario Galaxy's Bob-omb Blasting minigame only happening in Battle Rock and Dreadnought Galaxies, which shared common characteristics like being fortress-like and having boss battles agaisnt Topmaniac.