Part One: Artificial Gravity
Above is a photo of all the Ender's Game gravity secrets. The way the "artificial gravity" works is simple. You see the giant ring in the picture? Inside that ring is where all of the various rooms such as bunks, mess hall , etc are placed. The rooms are all attached, according to this orientation, sideways. Then the ring spins super fast and experiences a type of kinetic energy that is known as centrifugal force. Have you ever done the trick where you grab a bucket of water, spin around, and nothing falls out? It's the same principal. The only difference is that it's people inside, not water. This type of ship is called a Stanford Torus. VoilĂ ! Artificial gravity! Fast Fact: Did you know that astronauts experience 90% of Earth's gravity when in orbit? To find out how this works Click Here.
Part Two: Battle Rooms
An Ender's Game Battle Room would probably be something of circular shape and consist of walls made of powerful magnets. Instead of the hub that you see in the center of the stanford torus picture above, the battle room would be suspended in a sphere of electromagnets that would repel the room; therefore not letting it into the "centrifugal energy well" of the rest of the torus. When someone wants to enter the room, the sphere of magnets would somehow change their polarity, and the room would extend a collapsible corridor towards the opening in the torus.

