Prankster Comet

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Mario approaching a Galaxy currently orbited by a Speedy comet.

Prankster Comets are comets that appear in Super Mario Galaxy. They will appear from time to time in the orbits of the fifteen main galaxies, starting at the point when Mario or Luigi collect their thirteenth Power Star.

If the player travels to a galaxy when a Prankster Comet is in orbit, a special event will be triggered, which will usually change the gameplay of the level. Prankster Comets will only appear in galaxies after a specific Power Star in any given galaxy is collected. Also, when a Prankster Comet is in orbit, the player is forced to choose its level. No option is given to choose "normal" levels. However, there is a purple Luma near the Terrace who will shuffle the comets between available galaxies if fed twenty Star Bits.

By completing the event, the player will receive a Power Star. While a Prankster Comet is in orbit of a galaxy, players will need to completely restart the level each time they lose a life, instead of coming back at the last check point. Once a Prankster Comet's star has been collected, its star will become a selectable mission, only causing the comet to return to the corresponding galaxy at the player's request. All of the Prankster Comets also have their own music that plays during their missions.

There are five different types of Prankster Comets, each one a different color: red, white, blue, yellow or purple. These are also the colors that Pikmin come in.

Prankster Comets

Speedy Comet

• The Speedy Comet (レッドコメット Red Comet) requires Mario to complete a level within a certain time limit, usually from 4 to 6 minutes. Also, there will be a small changes in the galaxies. Good Egg Galaxy's boulders are all replaced by Chomps; Space Junk Galaxy has several coins placed on planets; Dusty Dune Galaxy has none of its enemies except the five Pokey Sprouts, the Pokey and the boulders; Dreadnought Galaxy has one Spiked Topman where there was a Spring Topman. Four galaxies are visited by the Speedy Comet; the Good Egg Galaxy, Dusty Dune Galaxy, Space Junk Galaxy, and Dreadnought Galaxy.

Galaxy	Episode Title	Based on	Time Limit
Good Egg Galaxy	Dino Piranha Speed Run	Dino Piranha	4:00
Space Junk Galaxy	Pull Star Path Speed Run	Pull Star Path	4:00
Dusty Dune Galaxy	Sandblast Speed Run	Blasting Through the Sand	4:30
Dreadnought Galaxy	Topman Tribe Speed Run	Revenge of the Topman Tribe	6:00

Daredevil Comet

• The Daredevil Comet (デスコメット Death Comet) sets Mario's max health to only one unit, as opposed to the usual three (or six with a Life Mushroom). Additionally, it removes all Life Shrooms from the level so that Mario cannot get them. Five galaxies are visited by the Daredevil Comet; the Battlerock Galaxy, Ghostly Galaxy, Gusty Garden Galaxy, Deep Dark Galaxy, and Melty Molten Galaxy. Four of them have the player fight a previously fought boss, with the sole exception being Melty Molten Galaxy, which has the player complete the entire first mission (The Sinking Lava Spire) with only one health unit.

Cosmic Comet

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Mario confronting Cosmic Mario in Sea Slide Galaxy.

• The Cosmic Comet (シャドウコメット Shadow Comet) pits Mario in a race against Cosmic Mario in a predetermined course with a star at the end. Mario must beat his duplicate to the Star. Four galaxies are visited by the Cosmic Comet; the Honeyhive Galaxy, Freezeflame Galaxy, Gold Leaf Galaxy, and Sea Slide Galaxy. Hint: To get a head-start in front of Cosmic Mario, the player can hold forward on the Nunchuk, and when the timer reaches 2, press Z and Mario should turn yellow giving him an advantage. If the player is playing as Luigi, they will be racing against Cosmic Luigi instead. Unlike Cosmic Mario, Cosmic Luigi is more intelligent, and will take advantage of any shortcuts that are available.

Fast Foe Comet

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Mario crossing the Cyclone Stone in the Beach Bowl Galaxy.

• The Fast-Foe Comet (クイックコメット Quick Comet) speeds up all enemies in a stage. Mario must complete the stage while avoiding the accelerated enemies. Only two galaxies are visited by the Fast-Foe Comet; the Beach Bowl Galaxy, and Toy Time Galaxy. Only Tox Boxes and Thwomps have been affected by this comet. The moving platforms also move faster. One familiar part is that it comes in galaxies with Tox boxes,which are the Beach Bowl and Toy Time only.

Purple Comet

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Mario approaching a Galaxy currently orbited by a Purple comet.

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Mario collects purple coins

• The Purple Comet (パープルコメット Purple Comet) is only available after the main story is beaten. Purple Coins are hidden throughout the galaxy, and Mario must retrieve one hundred, sometimes within a time limit, to retrieve the Star. Some Purple Comet missions have more than one hundred Coins, but Mario still only needs to collect one hundred for the Star. All fifteen "main" galaxies are visited by the Purple Comet. Timed Purple Comet missions, as well as the Battlerock and Dreadnought Galaxy's Purple Comet missions have unique background music, which some of it is a remix of the Gusty Garden Galaxy music.

Galaxy	Episode Title	Purple Coins available	Time limit
Good Egg Galaxy	Purple Coin Omelet	100	None
Honeyhive Galaxy	The Honeyhive's Purple Coins	100	None
Space Junk Galaxy	Purple Coin Spacewalk	100	2:00
Battlerock Galaxy	Purple Coins on the Battlerock	100	If Mario leaves a Coin, he loses a life.
Beach Bowl Galaxy	Beachcombing for Purple Coins	100	None
Ghostly Galaxy	Purple Coins in the Bone Pen	150	1:00
Gusty Garden Galaxy	Purple Coins on the Puzzle Cube	150	2:30
Freezeflame Galaxy	Purple Coins on the Summit	100	None
Dusty Dune Galaxy	Purple Coins in the Desert	100	None
Gold Leaf Galaxy	Purple Coins in the Woods	100	3:30
Sea Slide Galaxy	Purple Coins by the Seaslide	100	None
Toy Time Galaxy	Luigi's Purple Coins	150	3:00
Gateway Galaxy	Gateway's Purple Coins	100	None
Deep Dark Galaxy	Plunder the Purple Coins	100	None
Dreadnought Galaxy	Battlestation's Purple Coins	100	If Mario leaves a Coin, he loses a life.
Melty Molten Galaxy	Red-Hot Purple Coins	100	None
Grand Finale Galaxy	The Star Festival	100	None