Free online dominoes in partners or free for all, against computers that never cheat: three levels, hints, a daily hand and no ads.
Twenty-eight tiles and four players with seven each. In turn, play a tile that matches an open end of the line; if you can't, you pass. The hand goes to whoever runs out of tiles or, if the game is blocked, to whoever has the fewest points, and they score the rivals' points. Games go to 100, in partners or free for all.