thumb|650px|left|Marvel Hotline discussion with Orson Scott-Card featuring scenes from Marvel adaptation.The Battle Room is the core training exercise conducted at the military academy known as Battle School. The Battle Room is any of the nine identitcal zero-gravity arenas located at the rotating center of the Battle School. The school's administration runs regular battle simulations in these chambers, traditionally pitting two armies of students against each other. All students eligible for these battle simulations are divided into 41-person armies.
List of Battle School armies.
- Ferret Flame
Tradtionally, the rules of play are as follows: Two armies enter the room from opposing angles. Each participant wears a skin-tight Flash Suit that responds to light fired from a harmless weapon carried by each soldier. When specific portions of the Flash Suit are struck by this light, the suit will freeze up, potentially freezing arms, legs, or the entire person until the simulation is complete. Occasionally "Stars", or immovable objects, are placed in the room to provide cover or another surface from which to launch off or rebound in zero-gravity. The game is over when the winning team touches four helmets simultaneously to each corner of the opposing teams entrance and have a fifth soldier move through the entrance. These rules and victory conditions are subverted by both the adminstration and Ender during his time at the Battle School.