Follow these, step by step.
1. Download Zynga Texas HoldEm Poker on you Android/iOS device.
2. Login with Facebook or any other type of account. (Guest/Zynga account)
3. Click on the Settings. and chose a REDEEM option.
4. Copy the code and paste, or just type it with Qwerty keyboard. Y25ZCKX
Code : Y25ZCKX