The Pit was a caged, gladiatorial fighting arena in Fillydelphia that used to be an ice-skating rink at the Fillydelphia FunFarm. Bleachers rose above the caged arena for spectators to watch and there was a raised, barricaded platform behind the arena from which Red Eye's officials would observe the Pit's fights. The perimeter of the Pit had three doors, two for the combatants, and a third for guards to enter if something goes wrong.
Several unmarked barrels were suspended from the arena's cage ceiling above pressure plate switches. When the switch below a barrel was pressed, it would drop the barrel above it, spilling its contents on the ground. The contents of these barrels were typically radioactive goo, tainted ooze, mines, and/or weapons.
In standard Pit fights, each door would have 5 contestants, each assigned a number from 1 to 5. These contestants would fight against contestants from the other door one-on-one, in order, to the death, until all the fighters from one of the doors were dead. This gave a distinct disadvantage to contestants assigned number 1, who would have to defeat all 5 of the other door's opponents in order to survive. Conversely, contestants assigned number 5 had a distinct advantage, in that they might not have to fight at all.