The Kaiju Battle Arena is a colossal colosseum built by the Vortaak in the LBP Universe that contains all of their monsters. It is used to watch Kaiju Battles. It has many chambers, each one has an Absolute Zero Cannon and a bridge. The chambers can have any of the following wall paint: Blue, Green, Red, Yellow, Purple or Boring Grey. All Absolute Zero Cannons are customized differently, the bridges as well. The bridges move at a certain speed, and if you fall off the bridge, you will die.
Three chambers of the KBA appear in The All-Out Attack Parts 1, 2 & 3, each one contains a different monster: Mecha-Gigan, Mechagodzilla 4000 and Mecha-King Ghidorah respectively. The last chamber was intentionally broken by the Vortaak to make it much more difficult for Sackboy to defeat Mecha-King Ghidorah. Sackboy landed on an KBA exit, but there was an Anti-Projectile Scanner there, making the supposed to be easy mission of the Vortaak an epic fail.