Buying games on iTunes with a gift card is a convenient way to add new games to your library without using a credit card. Gift cards can be purchased at most retail stores and online, and they can be redeemed for any item in the iTunes Store, including games, apps, music, and movies.
To buy a game on iTunes with a gift card, first open the iTunes Store app on your device. Then, tap on the Games tab and browse the available games. Once you find a game that you want to buy, tap on the price button. On the next screen, tap on the Redeem button and enter the code from your gift card. The amount of the gift card will be applied to the purchase price of the game.