2048 for Chromecast (co-op multiplayer) (play.google.com)

Co-op multiplayer, as in you take turns. Admittedly that can make for a slow game especially at the beginning.

Players can join/leave anytime during the game. When the last player leaves, the game quits.

Hope to have time to make a side-by-side versus mode, as I can imagine that being a lot of fun.