Engineer Robot

The Engineer Robot is used to break down the firewalls that block each floor; as you upgrade the parts to your robot, the more powerful it becomes and the faster the firewall goes down. The firewalls get progressively stronger, so upgrading your Engineer Robot is crucial for keeping a stable pace; of course, you can hold back on purchasing the robot upgrades so that the firewalls take longer to bring down, allowing you more time to gather Samples, hunt Super Zombies and purchase other upgrades for Combat Squad, Vehicle and other.
 * Engineer Robot