Boo Block

Boo Blocks (also called Boo Buddy Blocks or Block Boos) are enemies that first appear in Super Mario World. They are Boos that have the ability to turn into blocks.

Appearances

Super Mario World

Boo Blocks only appear in some of the Ghost Houses in this game. Similar to regular Boos, Boo Blocks will only approach Mario when his back is turned. However, when Mario is looking at them, the Boo Blocks will take the form of a solid block that Mario can actually stand on. This is required to clear a certain Ghost House.

Boos
Characters
Big Boo • Bigger Boo • Black Boo • Boolossus • Boos in Luigi's Mansion • Boos in Luigi's Mansion: Dark Moon • Bootler • Franky • Herbert • Igor • King Boo • King Boo (Super Mario Sunshine) • Lady Bow • Lahla • Peeka • Spooky Speedster • Stanley • The Creepy Steeple Boo
Species
Balloon Boo • Big Boo • Big Boo (Paper Mario) • Big Frame Boo • Big & Little Boo • Blindfold Boo • Bomb Boo • Boo • Boo Balloon • Boo Block • Boo Buddy Snake • Boo Buddy Swarm • Boo Guy • Boohemoth • Boo Man Bluff • Boo Stack • Calm Fishin' Boo • Circling Boo Buddies • Dark Boo • Dark Dark Boo • Disappearing Boo Buddy • Eerie • Fishin' Boo • Frame Boo • Ghoul Guy • Gold Boo • Green Boo • Li'l Boo • Mad Big Boo • Mad Boo • Mini Boo • Octoboo • Peepa • Phantom Guy • Red Boo • Shiny Boo • Sleepy Boo • Snufit • Stretch • Tail Boo • Terekuribō

Characters	Protagonists	Mario • Princess Peach • Luigi • Yoshis
	Antagonists	Bowser • Iggy Koopa • Morton Koopa Jr. • Lemmy Koopa • Larry Koopa • Wendy O. Koopa • Roy Koopa • Ludwig von Koopa
Worlds	Yoshi's Island	Yoshi's House • Yoshi's Island 1 • Yoshi's Island 2 • Yoshi's Island 3 • Yoshi's Island 4 • Yellow Switch Palace • Iggy's Castle
	Donut Plains	Donut Plains 1 • Donut Plains 2 • Donut Plains 3 • Donut Plains 4 • Donut Secret 1 • Donut Secret House • Donut Secret 2 • Top Secret Area • Donut Ghost House • Green Switch Palace • Morton's Castle
	Vanilla Dome	Vanilla Dome 1 • Vanilla Dome 2 • Vanilla Dome 3 • Vanilla Dome 4 • Vanilla Secret 1 • Vanilla Secret 2 • Vanilla Secret 3 • Vanilla Ghost House • Vanilla Fortress • Red Switch Palace • Lemmy's Castle
	Twin Bridges	Cheese Bridge Area • Soda Lake • Cookie Mountain • Butter Bridge 1 • Butter Bridge 2 • Ludwig's Castle
	Forest of Illusion	Forest of Illusion 1 • Forest of Illusion 2 • Forest of Illusion 3 • Forest of Illusion 4 • Forest Ghost House • Forest Secret Area • Forest Fortress • Blue Switch Palace • Roy's Castle
	Chocolate Island	Chocolate Island 1 • Chocolate Island 2 • Chocolate Island 3 • Chocolate Island 4 • Chocolate Island 5 • Choco-Ghost House • Chocolate Secret • Chocolate Fortress • Wendy's Castle
	Valley of Bowser	Sunken Ghost Ship • Valley of Bowser 1 • Valley of Bowser 2 • Valley of Bowser 3 • Valley of Bowser 4 • Valley Fortress • Valley Ghost House • Larry's Castle • Back Door • Front Door
	Star World	Star World 1 • Star World 2 • Star World 3 • Star World 4 • Star World 5
	Special World	Gnarly • Tubular • Way Cool • Awesome • Groovy • Mondo • Outrageous • Funky
Bosses	Major Bosses	Bowser • Iggy Koopa • Morton Koopa Jr. • Lemmy Koopa • Larry Koopa • Wendy O. Koopa • Roy Koopa • Ludwig von Koopa
	Mini Bosses	Reznor • Big Boo
Enemies	Enemies & Hazards	Amazing Flyin' Hammer Bro. • Ball 'n' Chain • Banzai Bill • Beak Pillar • Big Boo • Big Bubble • Big Steely • Blargg • Blurp • Bob-omb • Bony Beetle • Boo Buddy • Boo Block • Boo Buddy Snake • Boo Buddy Swarm • Bullet Bill • Buzzy Beetle • Chainsaw • Chargin' Chuck • Cheep-Cheep • Circling Boo Buddies • Climbing Koopa • Dino Rhino • Dino-Torch • Disappearing Boo Buddy • Dry Bones • Eerie • Falling Spike • Fishbone • Fishin' Boo • Fishin' Lakitu • Floating Mine • Flying Goomba • Fuzzy • Galoomba • Gold Bowser Statue • Gray Bowser Statue • Grinder • Hothead • Jumping Piranha Plant • Jumping Pumpkin Plant • Kamikaze Koopa • Koopa Troopa • Koopa Paratroopa • Lakitu • Lava Bubble • Li'l Sparky • Magikoopa • Mask Koopa • Mecha-Koopa • Mega Mole • Monty Mole • Muncher • Ninji • Para-bomb • Paragoomba • Para Mask Koopa • Pidgit Bill • Pillar • Pipe Lakitu • Piranha Plant • Pokey • Porcupuffer • Rex • Rip Van Fish • Skewer • Spike Top • Spiny • Sumo Bro. • Super Koopa • Swooper • Thwimp • Thwomp • Torpedo Ted • Urchin • Volcano Lotus • Wiggler
Miscellaneous	Items	Super Mushroom • Fire Flower • Cape Feather • Star • 1-up Mushroom • 3-Up Moon • Key • Coin • P-Balloon • Dragon Coin • P-Switch • Berry • Yoshi's Wings• Jumping Board • ? Ball • Silver Coin • Grab Block • Coin Snake