Boom Boo
From Sonic Retro
A Boom Boo ghost in Death Chamber.
Boom Boo, ブー, is a ghost that appears in several haunted stages of Sonic Adventure 2. They look like giant versions of Boo normal type. They have only one attack, which is to slowly move towards the character. Hitting them once will reduce their size, to a larger version of Boo attack type and another hit will make them Boo attack types completely. Therefore they take three hits to disappear and award 300 points.
| Character | Stage | |
|---|---|---|
| Normal mode | Hard mode | |
| Sonic | Pyramid Cave | |
| Knuckles | Death Chamber | Pumpkin Hill, Aquatic Mine, Death Chamber |