Fart

 is a Tier 5 Tank that upgrades from Flank Builder and Fort at level 60.

Design
The has the same slightly-elongated Basic barrel in front as Flank Builder, but its rear Builder is replaced with a Fort gun. It can also be described as a Flank Builder with a Contagion cannon in the Builder. The Fort gun setup looks identical to the one on Fort.

Technical
Uniquely, the 's blocks fly forwards to the mouse, not to the equivalent distance behind.

As the

 * Since your blocks go forward, you can treat this as a version of Fort with stronger bullets but delayed blocks.
 * Your rear Contagion cannon boosts you forward ever so slightly.

Trivia

 * This tank is presumably a joke tank, implied by its poor performance and childish name. Its name is a pun on Fort.