Ball

Ball is a Testbed Miscellaneous tank that bounces when struck by anything. It cannot be killed except by Arena Closers and Sandman. It is an orange circle that is much larger than a tank, around the size of a boss.

Design
Ball is a very large round orange tank with no barrels.

Technical
Ball has a negligible amount of Body Damage, just enough to kill Eggs. When the Ball hits another Ball, it gets bounced in the opposite direction, sometimes at a high velocity. With enough trial and error (as well as enough Balls), a Ball could get shot out of the arena and stay glitched there for a while, as it is moving faster than it can be rendered. Balls bounce around Portals for a while instead of immediately falling in.

Trivia

 * The Ball can still get assist kills, even without any body damage. This is because you don't have to deal damage to get an assist kill, you just have to be contacting the entity in question when it dies.
 * When a Ball is a very large distance from the normal Arena after being bounced at a high velocity, it glitches and flickers until it reenters the Arena.