The Official Zombie Strike RPG Page is the most active source for monthly gift codes.

The redemption process varies depending on which version of the game you are running:

Mastering requires a blend of tactical squad building and resource management. Whether you are playing the mobile AFK RPG Zombie Strike: Last War or the popular Roblox experience, using CD Key codes is the fastest way to secure free Gems, Gold, and Gear. Active Zombie Strike CD Key Codes (May 2026)

Some high-value codes require your account to be a certain level (often Level 5 or higher) before they can be redeemed.