Location from enders-game by Orson Scott Card
A 100-meter cube of zero gravity where children fight with flash pistols — the crucible where Ender learned that 'the enemy's gate is down' and everything about war is a matter of perspective.
The Battle Room is where armies prove themselves. Two teams of forty enter from opposite gates, floating in zero-g, and attempt to either freeze all opponents or pass soldiers through the enemy's gate. Flash pistols freeze the flash suits students wear. Ender's innovation — 'the enemy's gate is down' — reoriented his army to treat the enemy gate as the floor, attacking feet-first to minimize target profile. It seems obvious in retrospect. Nobody had thought of it. Dragon Army won every match using this and other unconventional tactics. When the adults changed the rules (unfair matchups, back-to-back battles, two armies at once), Ender adapted. The Battle Room taught him that the system is always rigged, and winning means redefining what the game actually is.
A 100m cubed zero-gravity chamber. Floating obstacles ('stars') provide cover. Two gates on opposite walls — one for each army. Flash pistols freeze opponents' suits. The room is cold, dark, disorienting, and the single most important training environment in the Enderverse.
Also known as: Battle Room, The Room