: Every player has a unique alphanumeric ID (like 8762f9k or 8ms3723 ). When a new player enters an existing player's code, both typically receive a small reward, such as Rubies or Dark Gold. How to Redeem Codes To claim your rewards, follow these steps within the game: Open Grim Defender on your iOS or Android device.
You can often generate a unique, one-time-use bonus code for 1 Dark Gold by visiting the official Grim Defender Bonus Page . grim defender codes
Source: Ahn, J., Lee, J., & Kim, J. (2021). Implementation and Performance Evaluation of Grim Defender. IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 29(4), 834-844. : Every player has a unique alphanumeric ID