Open the Messages app on your iPhone or iPad
Open an existing conversation or start a new one
Tap the App Store icon next to the text field
Search for an iMessage game app
Download and install the game
Open the game from the iMessage app drawer
Invite the other person to play if needed
Follow the on-screen instructions to start the game
Take turns by sending moves through Messages
Keep playing until the game ends
Tap the game again anytime to continue a saved match