internal abstract void ReadSpecific(BinaryReaderEx br, long start);
 internal Other(BinaryReaderEx br) : base(br)
 {
 }
 internal Player(BinaryReaderEx br) : base(br)
 {
 }
 internal Collision(BinaryReaderEx br) : base(br)
 {
 }
 internal Enemy(BinaryReaderEx br) : base(br)
 {
 }