Prankster Comet

File:Galaxy.jpg

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.

Prankster Comets re-appear in Super Mario Galaxy 2. Here, Prankster Comets only appear once the player has collected a Comet Medal in a certain galaxy, and has collected a certain number of other comet medals from other galaxies. There is a minor change - the comets are now yellow for Power Stars, while green for Green Power Star missions, which are only available after Mario collects 120 Regular Power Stars and defeats Bowser in his Galaxy Generator once again. Galaxies under the influence of a Prankster Comet are given a generic symbol. This opens up the comet Star mission, although the player may have the option to select the mission, as opposed to the first game. As comet missions are no longer categorized by color clues, the next list names them in regards to the missions' titles.

There are five different types of Prankster Comets in the first game, each one a different color: red, white, blue, yellow or purple.

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 small changes in the galaxies. For example, 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

This comet also reappears in Super Mario Galaxy 2. An informal list of galaxies visited by it includes the Sky Station Galaxy, Bowser Jr.'s Fiery Flotilla, Hightail Falls Galaxy, Bowser's Lava Lair, Rolling Masterpiece Galaxy, Supermassive Galaxy, Bowser's Gravity Gauntlet, Throwback Galaxy, Bowser's Galaxy Generator, the Stone Cyclone Galaxy, and the Boss Blitz Galaxy.

Galaxy	Episode Title	Based on	Time Limit
Sky Station Galaxy	Peewee Piranha's Speed Run	Peewee Piranha's Temper Tantrum	0:20*
Bowser Jr.'s Fiery Flotilla	Fiery Flotilla Speed Run	Gobblegut's Aching Belly	2:00
Hightail Falls Galaxy	Hightail Falls Speed Run	Hot-Stepping Dash Pepper	3:00
Bowser's Lava Lair	Lava Lair Speed Run	Bowser's Big Lava Power Party	0:30*
Rolling Masterpiece Galaxy	Masterpiece Speed Run	Silver Chomp Grudge Match	2:00
Supermassive Galaxy	Big Wigglers Speed Run	Huge Trouble with Big Wigglers	2:30
Bowser's Gravity Gauntlet	Gravity Star Speed Run	Breaking into Bowser's Castle	0:30*
Throwback Galaxy	Whomp Silver Star Speed Run	Silver Stars in the Whomp Fortress	2:00
Bowser's Galaxy Generator	Bowser's Big Bad Speed Run	Bowser's Fortified Fortress	0:30*
Stone Cyclone Galaxy	Tox Box Speed Run	Silver Stars on the Cyclone (exept with no silver stars or switches)	0:20*
Boss Blitz Galaxy	Throwback Throwdown Speed Run	Throwback Throwdown	5:00

The galaxies with a * next to their time limits have Timers scattered throughout the mission; collecting one adds 10 seconds to the player's time limit.

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.

The Daredevil Comet is also in Super Mario Galaxy 2 in Spin Dig Galaxy, Bowser Jr.'s Fearsome Fleet, the Slipsand Galaxy, Bowser Jr.'s Boom Bunker, the Battle Belt Galaxy, and the Grandmaster Galaxy.

Cosmic Comet

File:Cosmicclone.jpg

Mario racing 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

File:FastFoeComet photo.jpg

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. Tox Boxes, Thwomps, and moving platforms are the only things affected.

Purple Comet

File:Purplecomet.jpg

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

There are also Purple Comets in Super Mario Galaxy 2. They are the same as Super Mario Galaxy but, instead of having to beat the game for Purple Comets to come, Mario needs to get different Comet Medals in some galaxies, and they are not necessary to appear in all "main" galaxies.

Galaxy	Episode Title	Purple Coins available	Time Limit
Flip-Swap Galaxy	Purple Coin Flip 'n' Sprint	100	3:00
Puzzle Plank Galaxy	Purple Coin Shadow Vault	100	1:00
Tall Trunk Galaxy	Tall Trunk's Purple Coin Slide	100 out of 140 needed	None
Flipsville Galaxy	Purple Coin Spin Speed Run	100	2:30
Starshine Beach Galaxy	Purple Coin Beach Dash	100 out of 140	0:35
Sweet Mystery Galaxy	Bulb Berry's Purple Coin Glow	100	None
Clockwork Ruins Galaxy	The Adventure of the Purple Coins	100	5:00
Mario Squared Galaxy	Luigi's Purple Coin Chaos	100	2:00
Rolling Coaster Galaxy	Purple Coins on the Rainbow Road	100 out of 110	2:00

Clone Comet

Multiple Cosmic Clones appears on a selected mission. The player needs to redo the whole or part of the mission while there are Cosmic Clones. The comet appears in the Cloudy Court Galaxy, the Haunty Halls Galaxy, the Chompworks Galaxy, and the Flip-Out Galaxy. It is fused with the missions Luigi's Purple Coin Chaos and Green Star 2 for Flip-Out Galaxy, and Puzzle Plank Galaxy's Purple Coin Shadow Vault

Romp Comet

Defeat a certain amount of enemies in a time limit, often with a power-up. The comet appears in the Yoshi Star Galaxy, the Boulder Bowl Galaxy, the Flash Black Galaxy and the Shiverburn Galaxy.

Double Time Comet

Makes the player redo a level, but with the objects moving faster. It appears in Beat Block Galaxy and Twisty Trials Galaxy.

Green Comet

Makes some Green Stars appear in all levels, usually in hard to reach places.