How to Invite Friend on "Tetris Friends"by Joshua Benjamin ; Updated September 22, 2017
"Tetris Friends" takes the old, addicting game of "Tetris" and allows you to play it competitively online. You can play a game against a total stranger, or invite your Facebook friends to join in your own personal grudge match. It's simple to invite friends to your game.
Launch the "Arena" mode from the "Tetris Friends" website.
Wait for the screen to load, then click the "Create Room" option on the right side of the screen.
Select the options you want for your room, then click the "Create" button.
Click the "Invite Friends" button, once the room has finished loading.
Select the friends you wish to invite, and click "OK." The invite will automatically go out to the friends you have selected, whereupon they can accept or reject the invite at their leisure.