Codes, Action Tower Defense Official Wiki

Active Codes are currently Redeemable. This can be confirmed as either the player successfully redeeming the code, or being met with an error message of the player having already redeemed the code. (if you find any active codes to be expired, please move them down to the expired area.) Inactive Codes are expired and cannot be redeemed anymore. This can be confirmed as the player would be met with an error message of the code being invalid.

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