|Game(s)||Newer Super Mario Bros. DS|
|First appearance||(DS) The House of Blocks|
|Final appearance||(DS) The House of Bogus|
Balloon Boos are spherical white ghosts akin to Boos with small stubby arms and a stubby tail. They have a perpetually uncomfortable expression on their pink-cheeked faces.
Balloon Boos are usually quite large in size compared to the player due to all of the air they store in their bodies. This large stature can quickly fade away once they chase the player, which decreases their size greatly as they use the air in their bodies to thrust themselves forward.
Active Balloon Boos will start large, floating in place as long as the player looks in their direction. Once the player turns around, however, they will begin to give chase, slowly decreasing in size until they're about the size of two tiles, akin to a player in their Super form. They will continue to chase, even at their smallest size, until the player once again faces their direction, to which they will stop and slowly breathe in the air they lost, increasing in size until they grow back to their default.
Inactive Balloon Boos will forever stay large, motionlessly floating in place. These Balloon Boos act more so as obstacles for the player to work around than actual enemies.
Contact with a Balloon Boo damages the player if they do not have a Super Star or Mega Mushroom equipped, which are both the only ways to defeat them. Fireballs from a Fire Flower and hammers from a Hammer Suit thus prove ineffective against Balloon Boos.
|Areas||Levels||Sandy Shore • Unagi Borough • Palmthorn Beach • Dorrie Den • Skeeter Coast • Hivetree Tower • Honeycomb Thicket • The House of Blocks • Overgrown Armoury|
|Other||Item House • 1-UP House • Mega House • World 3-|
|Enemies||Enemies||Balloon Boo • Big Dry Bones • Big Goomba • Big Wiggler • Boo • Cheep Cheep • Cheep Chomp • Crowber • Deep Cheep • Dry Bones • Dorrie • Fire Piranha Plant • Goomba • Koopa Paratroopa • Koopa Troopa • Lakitu • Mega Deep Cheep • Mega Unagi • Micro Goomba • Piranha Plant • Scuttlebug • Skeeter • Spike Bass • Spiny • Squiggler • Unagi • Wiggler|
|Bosses||Bowser Jr. • Cheepskipper|
|Areas||Levels||Pumpkin Thornhill • Broozer Sward • Ectoplasm Hollow • Spiritful Steeple • Bone Marrow Road • Flimsy Gulch • The House of Doors • Arachnid Charnel • Grimoire Grounds • Derelict Schooner|
|Other||Item House • 1-UP House • Mega House • World 4-|
|Enemies||Enemies||Balloon Boo • Banzai Bill • Big Bone Piranha Plant • Big Dry Bones • Big Splunkin • Bone Goomba • Bone Piranha Plant • Boo • Broozer • Bullet Bill • Circling Boo Buddies • Crowber • Dry Bones • Scuttlebug • Splunkin • Sushi|
|Bosses||Bowser Jr. • Dry Bowser|
|Areas||Levels||Lavender Skybridge • The House of Bogus • Muncher Romp • Tipsaw Trench • Skewerspring Tower • Cloudbolt Chasm • Gigantic Gardens • Gusty Gap • Spiny Swings • Ballistic Breach • Stormeye Stronghold|
|Other||Item House • 1-UP House • Mega House|
|Enemies||Enemies||Balloon Boo • Banzai Bill • Big Buzzy Beetle • Big Dry Bones • Big Koopa Troopa • Big Muncher • Big Piranha Plant • Big Spiny • Big Whomp • Broozer • Bullet Bill • Cloudoboo • Dry Bones • Fly Guy • Hammer Bro • Koopa Paratroopa • Koopa Troopa • Muncher • Paragoomba • Piranha Plant • Shy Guy • Spiny • Thunder Cloud • Whomp|
|Bosses||Bowser Jr. • Lakithunder|