If you want to start a game with a friend:
- Select the orange Play Now! button at the bottom of the main screen, then Classic mode.
- Enter the username or email address of the person you wish to play with, on the Select Opponent screen.
- Tap on their profile picture and then the Play button to start the game.
On the other hand, remember that you will have the possibility to invite friends to download the game through the Invite friends option in the Games tab. To do this, you will have to go to the list icon located in the second option of the bottom bar of the screen.
We invite you to read more about this in the article How can I invite a friend?
If you are part of a team, you can also play Tower Duel mode with your teammates. To learn more about how to play with your teammates, we invite you to visit the following article: How can I play Tower Duel with my teammates?