First of all you’ll need to find the place to enter the Gift Codes.
From the start screen click: Options.
Then click the gift logo in the top of the screen.
This combination will give you a free Referee Costume:
This combination will give you the Kung Fu Taunt:
This combination will grant you x5 Banana Perks:
This will bring you the Laughing Taunt:
And finally this will give you x5 Score Perks:
