Zipper

The Zipper is a Tier 4 tank that upgrades from Contagion or Swarming Trapper at level 45.

Design
The Zipper has a round body. There's a thin rectangular gun, and a bit shorter and wider guns. There's also a small trapezoidal gun placed on the Trapper guns, like 's.

Technical
The Zipper actually has no stat changes from the predecessors. The bullet has Contagion's stats, the trap has the same stats with Contagion and Swarming Trapper, and the the swarm drone has Swarming Trapper's stats.

Upgrades
The Zipper can upgrade from the or  at level 45.

The Zipper can upgrade into the following:
 * (Level 60)