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Star Piece Clusters^[1] are semi-common items that consist of big blue Star Bits with spiky white crystal structures in them in Super Mario Galaxy and Super Mario Galaxy 2. They appear more often in Super Mario Galaxy 2 than in its predecessor. They are most commonly seen floating in space directly in the path of a Launch Star. When Mario or Luigi flies through the path, he smashes right through the Star Piece Cluster, releasing multiple separate Star Bits that circle around him and can be collected with the Star Pointer until he lands on the next planet.

In Super Mario Galaxy 2, Star Piece Cluster Rocks^[2] can sometimes be found floating just above the ground, though this is extremely rare, as this happens only during one mission in the Melty Monster Galaxy. In this mission, the Star Piece Cluster Rocks will be destroyed if they are hit by Rock Mario or Rock Luigi. For some reason, Star Piece Cluster Rocks produce only four Star Bits when broken. These clusters can also be broken by the Co-Star Luma's spin.

It is also possible to break a Star Piece Cluster by using Mario or Luigi's Star-Spin. To do this, he must go to the Cloudy Court Galaxy, choose the first mission, grab a Cloud Flower, and traverse through until he reaches the highest cymbal next to the Launch Star while having one carrying three clouds. At this point, there is a Star Piece Cluster in the Launch Star's path. The player must try to reach the Star Piece Cluster by creating clouds at the peak of their backward somersaults towards the Star Crystal. Even though the jumps may not be high enough, the last backward somersault can reach the Star Piece Cluster. At the peak of the last somersault, the player must star-spin at the Star Piece Cluster; the Star Piece Cluster breaks and Star Bits follow the player.

Three Star Piece Clusters also appear on the World Map: one near the end of World 1, and two at the beginning of World 2. The player can maneuver Starship Mario into these Star Piece Clusters in order to break them and release the Star Bits inside. These Star Piece Clusters appear to have a spiky yellow crystal inside them, and they release eight Star Bits when broken.

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Characters	Protagonists	Mario • Luigi • Yoshi • Co-Star Luma
	Non-playable	Baby Luma • Bill Board • Black Jibberjay • Bob-omb Buddies • Bowser • Bowser Jr. • Co-Star Luma • Coach • Cosmic Spirit • Fluzzard • Gearmos (Gold · Silver) • Honeybees • Hungry Lumas (Coin Lumas) • Jibberjays • Lubba • Lumalee • Lumas • Penguin • Penguru • Piantas • Princess Peach • Queen Bee • Rosalina • Seagull • Star Bunnies • The Chimp • Toad Brigade • Toads • Whittles
	Antagonists	Bowser • Bowser Jr.
Enemies	Enemies	Amp • Astro Goomba • Banzai Bill • Bat • Big Amp • Big Gringill • Big Wiggler • Blooper • Bob-omb • Bomb Boo • Bomp • Boo • Boomerang Bro • Bullet Bill • Cheep Cheep • Chomp • Chomp Pup • Choppah • Clam • Cluckboom • Cosmic Clone • Crabber • Digga • Dry Bones • Elite Octoomba • Fizzlit • Flaptack • Flipbug • Flimp • Fuzzy • Gargantua Koopa Troopa • Gold Chomp • Golden Gummit • Goomba • Grand Goomba • Gringill • Ground Urchin • Gummit • Hammer Bro • Huge Paragoomba • Jack O'Goomba • Jammyfish • Kleptoad • Koopa Troopa • Lakitu • Li'l Brr • Li'l Cinder • Magikoopa • Magmaargh • Magmaw • Mandibug • Mattermouth • Mega Boo • Mega Thwomp • Micro Mecha-Bowser • Micro Goomba • Mikey Mine • Octoboo • Octoguy • Octoomba • Octopus • Paragoomba • Pinhead • Piranha Plant • Piranhacus Giganticus • Podoboo • Pokey Head • Preying Mantas • Prickly Piranha Plant • Puffer Fish • Pupdozer • Rhomp • Ring Beamer • Sentry Beam • Silver Chomp • Skeeter • Slurple • Smeech • Snoodle • Spiky Gummit • Spiky Piranha Plant • Spiky Topman • Spiny • Spiny Hermit • Spiky Stretch Plant • Spiny Egg • Spoing • Sprangler • Spring Robot • Spring Topman • Starbag • Swaphopper • Thwomp • Topman • Topmini • Tox Box • Twirlip • Undergrunt • Undergrunt Gunner • Urchin • Venus Flower Trap • Whimp • Whomp • Wiggler
Obstacles	Obstacles	Banzai Bill Cannon • Bars • Bill Blaster • Black Hole • Bob-omb Dispenser • Bowser Statue • Boulder • Buzz Saw • Cactus • Chomp box • Current • Dark matter • Electric rail • Electricity Shooter • Fire Arm • Fire Shooter • Gravity field • Lava • Lava Plume • Ledge Hammer • Meteor • Millstone • Mud • Poison Swamp • Prickly Plant • Quicksand • Ring of Fire • Space Mine • Spike Block • Water Shooter • Wind
Bosses	Bosses	Peewee Piranha • Giga Lakitu • Digga-Leg • Gobblegut • Mandibug Stack • Bugaboom • Rollodillo • Sorbetti • Megahammer • Glamdozer • Squizzard • Prince Pikante • Boomsday Machine • Whomp King • Fiery Gobblegut • Giant Bowser • Dino Piranha • King Kaliente • Major Burrows • Bouldergeist • Fiery Dino Piranha
Galaxies	World 1	Sky Station Galaxy • Yoshi Star Galaxy • Spin-Dig Galaxy • Fluffy Bluff Galaxy • Flip-Swap Galaxy • Rightside Down Galaxy • Bowser Jr.'s Fiery Flotilla
	World 2	Puzzle Plank Galaxy • Hightail Falls Galaxy • Boulder Bowl Galaxy • Cosmic Cove Galaxy • Wild Glide Galaxy • Honeybloom Galaxy • Bowser's Lava Lair
	World 3	Tall Trunk Galaxy • Cloudy Court Galaxy • Haunty Halls Galaxy • Freezy Flake Galaxy • Rolling Masterpiece Galaxy • Beat Block Galaxy • Bowser Jr.'s Fearsome Fleet
	World 4	Supermassive Galaxy • Flipsville Galaxy • Starshine Beach Galaxy • Chompworks Galaxy • Sweet Mystery Galaxy • Honeyhop Galaxy • Bowser's Gravity Gauntlet
	World 5	Space Storm Galaxy • Slipsand Galaxy • Shiverburn Galaxy • Boo Moon Galaxy • Upside Dizzy Galaxy • Fleet Glide Galaxy • Bowser Jr.'s Boom Bunker
	World 6	Melty Monster Galaxy • Clockwork Ruins Galaxy • Throwback Galaxy • Battle Belt Galaxy • Flash Black Galaxy • Slimy Spring Galaxy • Bowser's Galaxy Generator
	World S	Mario Squared Galaxy • Rolling Coaster Galaxy • Twisty Trials Galaxy • Stone Cyclone Galaxy • Boss Blitz Galaxy • Flip-Out Galaxy • Grandmaster Galaxy
Items	Items	? Coin • 1-Up Mushroom • Bee Mushroom • Berries • Blimp Fruit • Boo Mushroom • Brick Block • Bronze Star • Bubble • Bulb Berry • Clock • Cloud Flower • Coin • Comet Medal • Dash Pepper • Fire Flower • Grand Star • Green Power Star • Key • Life Mushroom • Music Note • Power Star • Purple Coin • Rainbow Star • Rock Mushroom • Silver Star • Spin Drill • Spring Mushroom • Star Bit • Star Chip • Star Crystal • Watermelon • Yoshi Egg
Objects	Objects	? Block • Airship • Arrow Sign • Assembly Block • Balloon • Banandelion • Bar • Beacon • Beat Block • Big Block • Blue Switch • Brick Block • Bubble • Bubbler • Cage • Cannon • Chance Cube • Checkpoint Flag • Cloud • Coconut • Crate • Divot • Empty Block • Flip-Out Wall • Flip-Swap Platform • Flipswitch Panel • Floaty Fluff • Flower Grapple • Flower (platform) • Flowers • Flying ? Block • Galactic Tornado • Gate • Glass case • Golden peg • Grate • Gravity switch • Green Shell • Ground-Pound Switch • Honeycomb wall • Ice block • Ice Meteor • Item Crystal • Key Door • Launch Star • Leaf raft • Lever Switch • Lift • Lucky Cube • Mega ? Block • Meteorite • Nail • Picture block • Pink block • Pipe • Pole • Portal • Pull Star • Purple Coin Ball • Ramp • Ring • Rock • Rubbery Bulb • Sand Bird • Shrinking platform • Sign • Sling Star • Snake Block • Snow sculpture • Snowball • Springboard • Sproutle Vine • Star Ball • Star Barrier • Star Piece Cluster Rock • Starship Mario • Starshroom • Stone circle • Stone Wheel • Stump • Swing • Teeter-totter moon • Teleporter • Tip Network • Torch • Treasure chest • Tree • Underwater ring • Warp Pad • Water Ball • Water spout • Watermelon
Moves	Moves	Backward somersault • Crawl • Crouch • Dash • Double jump • Double kick • Eat • Flutter jump • Ground pound • Head Shake • Jump • Kick • Long jump • Side somersault • Skate • Slide • Spin jump • Star Spin • Stomp • Sweep kick • Swim • Triple jump • Wall jump
Missions	Sky Station Galaxy	Peewee Piranha's Temper Tantrum • Storming the Sky Fleet • Peewee Piranha's Speed Run*
	Yoshi Star Galaxy	Saddle Up with Yoshi • Spiny Control • Spiny Rainbow Romp*
	Spin-Dig Galaxy	Digga-Leg's Planet • Silver Stars Down Deep • Digga-Leg's Daredevil Run*
	Fluffy Bluff Galaxy	Search for the Toad Brigade Captain • The Chimp's Stomp Challenge** • Every Planet Has Its Price
	Rightside Down Galaxy	Breaking the Laws of Gravity • The Great Crate Incinerator
	Bowser Jr.'s Fiery Flotilla	Gobblegut's Aching Belly • Fiery Flotilla Speed Run*
	Flip-Swap Galaxy	Think Before You Shake • Purple Coin Flip 'n' Sprint*
	Puzzle Plank Galaxy	The Puzzling Picture Block • Bugaboom's Back • Purple Coin Shadow Vault*
	Hightail Falls Galaxy	Hot-Stepping Dash Pepper • Hightail Falls Speed Run* • Silver Stars in Hightail Falls
	Boulder Bowl Galaxy	Rock and Rollodillo • C'mere, Goomba** • Rolling Crabber Romp*
	Cosmic Cove Galaxy	Twin Falls Hideaway • Exploring the Cosmic Cavern • Catch That Star Bunny
	Wild Glide Galaxy	Fluzzard's First Flight • Jungle Fluzzard Race**
	Bowser's Lava Lair	Bowser's Big Lava Power Party • Lava Lair Speed Run*
	Honeybloom Galaxy	*Bumble Beginnings • The Secret Wall Jump
	Tall Trunk Galaxy	The Flotacious Blimp Fruit • Tall Trunk's Big Slide • Tall Trunk's Purple Coin Slide*
	Cloudy Court Galaxy	Head in the Clouds • The Shadow Lining* • Silver Stars in the Purple Pond
	Haunty Halls Galaxy	A Glimmer of Bulb Berry • Sneaking Down the Creepy Corridor • Spooky Cosmic Clone Chase*
	Freezy Flake Galaxy	Bowser on Ice • Sorbetti's Chilly Reception • The Chimp's Skating Challenge
	Rolling Masterpiece Galaxy	Silver Chomp Grudge Match • Masterpiece Speed Run*
	Bowser Jr.'s Fearsome Fleet	Bowser Jr.'s Mighty Megahammer • Megahammer's Daredevil Bash*
	Beat Block Galaxy	Step to the Beep • Silver Stars in Double Time*
	Supermassive Galaxy	Huge Trouble with Big Wigglers • Big Wigglers Speed Run* • In Full Bloom
	Flipsville Galaxy	Flip-Flopping in Flipsville • Flipsville's New Digs • Purple Coin Spin Speed Run*
	Honeyhop Galaxy	The Sweetest Silver Stars • The Chimp's Score Challenge**
	Starshine Beach Galaxy	Surf, Sand, and Silver Stars • Climbing the Cloudy Tower • Purple Coin Beach Dash*
	Chompworks Galaxy	Where the Chomps Are Made of Gold • Spring into the Chompworks • Cosmic Clones in the Chompworks*
	Bowser's Gravity Gauntlet	Breaking into Bowser's Castle • Gravity Star Speed Run*
	Sweet Mystery Galaxy	Bulb Berry's Mysterious Glow • Bulb Berry's Purple Coin Glow*
	Space Storm Galaxy	Follow Me, Bob-omb • To the Top of Topman's Tower • C'mere, Topman**
	Slipsand Galaxy	Squizzard's Sandy Sinkhole • Sailing the Sandy Seas • Squizzard's Daredevil Run*
	Shiverburn Galaxy	Prince Pikante's Peppery Mood • Octo-Army Icy Rainbow Romp* • The Chimp's Ultimate Skating Challenge
	Boo Moon Galaxy	Silver Stars Pop-Up • Haunting the Howling Tower • The Star in the Sinking Swamp
	Upside Dizzy Galaxy	A Walk on the Weird Side • Burning Upside Dizzy
	Bowser Jr.'s Boom Bunker	Bowser Jr.'s Boomsday Machine • Boomsday Machine Daredevil Run*
	Fleet Glide Galaxy	Fluzzard's Wild Battlefield Glide • Fastest Feathers in the Galaxy**
	Melty Monster Galaxy	The Magnificent Magma Sea • A Stroll Down Rolling Lane • The Chimp's Bowling Challenge
	Clockwork Ruins Galaxy	Time for Adventure • The Adventure of the Purple Coins* • The Ledge Hammer Trap
	Slimy Spring Galaxy	The Deep Shell Well • The Chimp's Coin Challenge**
	Throwback Galaxy	Return of the Whomp King • Silver Stars in the Whomp Fortress • Whomp Silver Star Speed Run*
	Battle Belt Galaxy	Mini-Planet Mega-Run • Mini-Planet Daredevil Run* • Snacktime for Gobblegut
	Bowser's Galaxy Generator	Bowser's Fortified Fortress • Bowser's Big Bad Speed Run*
	Flash Black Galaxy	Jumping Around in the Dark • Dark Octo-Army Romp*
	Mario Squared Galaxy	Make Mario a Star • Luigi's Purple Coin Chaos*
	Rolling Coaster Galaxy	The Rainbow Road Roll • Purple Coins on the Rainbow Road*
	Twisty Trials Galaxy	Spinning and Spinning and Spinning • Turning Turning Double Time*
	Stone Cyclone Galaxy	Silver Stars on the Cyclone • Tox Box Speed Run*
	Boss Blitz Galaxy	Throwback Throwdown • Throwback Throwdown Speed Run*
	Grandmaster Galaxy	The Ultimate Test • The Perfect Run*
	Flip-Out Galaxy	Wicked Wall Jumps • Cosmic Clone Wall Jumpers*
Miscellaneous	Minigames	Crate Burning • Fluzzard Gliding • Star Ball Rolling
	Other	Star Pointer• Mario Mandate
Missions marked with an asterisk (*) are exclusively available while a Prankster Comet is in orbit. Missions marked with two asterisks (**) are only available when receiving a letter from Mailtoad.