Ball

The "Ball" was an unnamed class which was secretly added on the 13th of January 2017 and removed the same day, about 8 hours later. It is not known what the purpose of this class was, or if it was even intended to exist in the first place due to both its unusual design and the fact that it was in-game for less than a day.

Design
The only way to access the "Ball" while it was in-game was to press / once in sandbox mode; no other way to access it was discovered and it did not appear in the Class Tree.

The "Ball" was just that; a circle with no cannons, drone dispensers or any type of offensive device. It had the same stats as normal tanks however all bullet stats had no known effect. It had the same HP and movement speed as a Basic Tank.

Trivia

 * Many people quickly alluded to the "Ball" somehow being related to the quickly-reverted controllable auto turret update, as when occupied turrets died the tank would be shown as "Mounted Turret" and the tank model would simply be a circle, just like the "Ball" appeared on the deathscreen. However the ball has never officially been named.
 * However, no other connections to this have been found and it is speculated that the "Ball" was possibly the result of a corrupted update or Tank code accidentally being applied to a bullet entity.