Xbox Game Pass codes can be used to purchase games and add them to your account. However, some people have found that they can stack these codes so that they can purchase multiple games at once. This is called a “stack.” To stack Xbox Game Pass codes, you will need to create a new account and enter in the code for the game you want to purchase. Then, you will need to enter in the code for the second game on your account. Finally, you will need to enter in the code for the third game on your account. If you are having trouble stacking Xbox Game Pass codes, it may be helpful to try using a different computer or phone. Some people have found that they are able to stack codes on their phones because they have an app that helps them do this.