Cameo Round

This is a tradition in the Grand Battles that one round is a Cameo Round, where contestants that have already died in that battle, or who are participating in other Grand Battles appear in some bizarre form. This typically takes place on the fifth round of a Grand Battle.

Battleopolis
The fifth round of The Grand Battle; in this round contestants that have died in previous rounds come back as alternate versions of themselves, their memories buried underneath a fake set of memories in which they are normal residents of the city.

Value City Mall
The fifth round of The Grand Battle II; in this round contestants from other Grand Battles appear as mindless zombies rampaging through the shopping mall. Characters who were already Undead to begin with behave as they normally would.

Monte Casino
The fifth round of Battle Royale; apparently a Cameo Round. Those in the casino are humanised versions of contestants from other Grand Battles. Mike kills them all. Of course.

Garden of Shades
The fifth round of Pitched Combat; a monochrome orchard where the apples contain the shades of people from the contestants pasts as well as contestants from other Grand Battles.

Cervaled Fall
The fifth round of Intense Struggle; a futuristic prison facility, specially built by The Monitor. Copies of contestants from other battles are imprisoned here.

New Battleopolis
The fourth round of The Grand Battle (Season 2); the rebuilt remains of the original Battleopolis, now populated by a larger range of cameos.