CB Prawn Skip
The final boss of the Mermalair is Prawn. After SpongeBob shuts down the security system, Prawn is released from the Villain Containment System. Prawn is surrounded by disco tiles that flash rapidly. The fight consists of dodging his sonic waves and Ham-Mer robots. After Prawn's attacks finish, the disco floor reveals a lane to shoot a bubble bowl. Prawn takes 3 hits to defeat.
Out of bounds directly above the spawn, an invisible debug trigger exists. Touching this invisible trigger causes the fight to instantly complete. After the cutscene finished, the player is teleported back in-bounds on all platforms except for GameCube.
With an active Cruise Boost, SpongeBob can L-clip out-of-bounds and climb the outside of the map. From the top, the player can jump to the trigger and end the fight.