Mech Assemble: Zombie Swarm Gift Codes

Many players report a significant difficulty spike around Chapter 25. To pass this without spending money, you must switch from "AoE" (Area of Effect) weapons to "Single Target DPS" weapons (like the Laser Cannon or Drill Arm) to melt the Elite Bosses before they overwhelm you. Grinding previous stages for "Blue Cores" to upgrade your weapon parts is essential here.

Green Energy (the green cubes dropped by zombies) is the in-battle currency. It resets after every match. You use it to select one of three random upgrades (Roguelike perks) each time you level up during a run. Prioritize Fire Rate and Multishot upgrades early in a run to handle the swarm density.

Some codes have a fixed expiry date; others are withdrawn without a published deadline. Check any expiry shown beside a code, and redeem it while it is still listed as active. The expired-code list keeps older codes for reference.