King Boom Boo

From Sonic Retro

KingBoomBoo (Sonic X).jpg
King Boom Boo, the King of Ghosts
First seen: Sonic Adventure 2 (2001)

King Boom Boo (キングブーブ) is the leader of the ghosts that haunt the pyramid where Eggman’s secret base in Sonic Adventure 2 is located. He’s distinguishable from Boos and Boom Boos by his much larger size and ability to grunt, blue mouth with teeth and multicoloured tongue and eyes. He’s the fourth boss encountered in the Hero side story of Sonic Adventure 2 and fought by Knuckles after he finds the three Gate Keys that open the door towards the centre of the base.

This ghost also appears in Sonic X, with a different purpose of that in the games, and completely independent from the game adaptation. It's sealed in a old castle instead, where Lindsay's is shooting a film with her as lead role. The ghost is the leader of the ghosts as well and is able to mimic human speech, not limited to grunts. Although it's defeat is also related to an hourglass, the purpose and way of handling it are completely unrelated. The ghost doesn't have any attacks like the game's counterpart, and also seems to be more interested in mishief than into harming the heroes. However, when angered, it seems to take them on seriously.

Sonic Adventure 2


King Boom Boo
Game: Sonic Adventure 2
Maximum rings: DCicon.png 8, GCicon.png 16(?)
Hits to defeat: 4
Fought by: Knuckles

The boss arena is toroid shaped and mainly, it’s a slightly modified upper route of the central core of Death Chamber. The central mechanical section, which was labelled E-01, is replaced by a solid wall with the same prints as the interior pyramid levels along with new ones depicting large ghosts.

King Boom Boo will always occupy the whole track therefore the only option is to run away in the opposite direction. However, if Knuckles’ runs too fast, King Boom Boo will notice and turn to chase Knuckles in the opposite direction. King Boom Boo has three attacks, two while chasing: trying to bite Knuckles (which will always happens if he's close) and throwing homing blue flame projectiles, and one where he stops to breathe successive walls of impenetrable blue fire, which will sweep the whole track and stop 3/4 of where the ghost is. In this attack, its' possible to reach the ghosts' backs, that will only repel Knuckles if he attacks or touches the ghost. It will stay and place for a little to catch its breath, but it will start chasing Knuckles again, whether in the same direction or the opposite, whether Knuckles is on its front or backs, restarting the pattern.

  • Pattern 1 (0 and 1 hits): Blue flame projectiles (four), blue flame walls.
  • Pattern 2 (2 hits): Biting sprint, flame projectiles (six), flame walls
  • Pattern 3 (3 hits): Biting sprint, flame projectiles (eight), flame walls.

The blue flame walls is the only instance where the back of the ghost is reachable, where a jumping Boo ghost is, guarding an hourglass. When Knuckles flips the hourglass, the hatches on the ceiling will open and let the sunlight in. King Boom Boo doesn’t like the sunlight, so it’ll shrink into a shadow to hide in the floor or walls and quickly scuttle away. While the skylights are open, Knuckles should catch up to the shadow (that will climb up the walls past the first hit) and dig into it to force the ghost out in the open. King Boom Boo will then emerge in a smaller size than his non sunlight form and run away. It’s in this small window of time that Knuckles can successfully hit him to drain its health. It will continue running but at a higher velocity. It is possible to hit the ghost more than once, though hard. The trick is to run as close as you can to the wall so that you can catch up with it to land another hit. When the skylights close, King Boom Boo regains its size and invulnerability and the pattern starts all over again. With each hit, the ghost seems faster and the amount of time the skylight is open also seems smaller.


The music played while clashing with King Boom Boo is a different version of "Masters Of The Desert." The version used is missing the up-front guitar present in the Egg Golem version. The Egg Golem version is the only one that was present on the CD release of the soundtrack.

Sonic X

King Boom Boo isn’t part of Sonic X adaptation of Sonic Adventure 2. However, it’s the central plot of the stand-alone episode 19, The Ghost of King Boom Boo in the Old Castle (EN: Sonic's Scream Test). It tricks Amy into releasing them by faking Sonic’s voice.. After Amy realizes she has been tricked, she tries to hit it with her hammer spitefully, but the ghost is able to disappear quickly. However, Sonic is able to hit it with the aid of a Power Ring spindash. After this, the ghost is enraged and chases the group of heroes up a staircase, chewing and destroying them. As they reach the surface, Amy and Chris successfully seal King Boom Boo and the rest of the ghosts with the aid of an hourglass.

Sonic Adventure 2 / Sonic Adventure 2: Battle
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