If you purchased a game and can't find it on My Apps page, or you're asked to buy it again, make sure you're signed in to the same Google Account you used to buy the game.
- Run the Google Play Store app on your device.
- Touch the Play Store icon to see which account you're currently signed in.
- To change accounts, touch the dropdown arrow and choose a different account.
NOTE: Purchases can't be transferred between Google Accounts. Still you can install the game that you purchased with a different account. Just sign in to your Google Play Store app using the associated account, then reinstall the game on your device.