Tetriends is a variation of Tetris where players lineup blocks made of their Facebook friends' photos instead of geometric shapes. To advance to the next level, players must accumulate points by forming streaks of 3 or more matching friend photos. Each level introduces more friend photos that are randomly selected and positioned, making it more difficult to match friends. Higher levels also include a "joker" friend photo that can be used to complete any streak. The game aims to be socially fun by encouraging players to share their high scores, levels reached, and photos of friends they've "blown up" with their Facebook friends.