There are two ways to purchase Power Cores.

1. Tap on the Power Cores icon at the top-right corner of the home screen to go to the Power Cores section of the Store. Here you can choose to purchase any of the Power Core amount available.

2. If you are on the main screen of the game, tap the Supplies icon on the left-hand side of the screen to enter the Store. Tap the Power Cores tab to view and purchase Power Cores.