Here we are explaining step by step process through which you can check and redeem ASTD codes easily. All you need is to stay updated with the latest website (you may turn ON your notification for this website so that you may get a notification for every update). Each code only works for a short span of time and after some time it expires automatically.
Redeeming Code Process: -
Copy the ASTD gem Code from here.
Go to the Game and Open it.
Click the Button in the Bottom-Left Corner.
Click the redemption box from the Pop-up Screen.
Paste the code in that box.
If the code will be active and valid you will automatically get the gem for that code. Otherwise, in case of an expired code, it will have no effect.