Dominoes

Yes. No account, no download and no limit on games. If ads ever appear to keep the site running, they'll stay off the table.

A double-six set has 28 tiles: every pair of numbers from 0 (blank) to 6, each pair once. Each number appears on 7 tiles, 7 of the tiles are doubles, and the whole set has 168 pips. That's the set this game uses.

Yes, with up to three friends. Pick Draw, Block or All Fives with the tabs and tap Play a friend. Then choose 2, 3 or 4 players, and a friend or the computer for each other seat. Each friend gets their own link to send by text, email or chat, and the tiles are dealt once everyone's in. It works on a phone or a computer. Nobody's browser is sent another player's tiles until the hand is over, and the boneyard is never sent. The person who made the game is Player 1 and the others are Player 2, 3 and 4, the same on every screen. If someone closes the page, opening it again picks up the same game. A friend game with no moves for 14 days is deleted.

In Draw dominoes you take tiles from the boneyard when you can't play. In Block dominoes you pass instead, so the tiles left over after the deal are never used. Both score only at the end of a hand. All Fives also scores during play, whenever the ends of the line add up to a multiple of 5, and has a spinner that lets the layout grow in four directions.

Two to four. Against the computer it's you and 1, 2 or 3 computer players: pick the number in Settings, and it starts with your next game. With friends online it's 2, 3 or 4 at the table, at least one of them a friend, and the computer can take any seat you don't fill.

Pick Strong or Easy in Settings. The strong player remembers which numbers each player has passed on or drawn for, and plays to leave ends they can't match. In All Fives it takes points when they're there and avoids leaving easy scores for the next player. The easy one plays its heaviest tile that fits. In our two-player test games the strong player beat the easy one in 929 of 1000 Draw games, 877 of 1000 Block games and 996 of 1000 All Fives games. Neither looks at your tiles or the boneyard.

Yes. Turn on "Show numbers instead of dots" in Settings and every tile shows two big numerals. Each number also has its own dot color, but the count and the pattern always tell you the number too.

Against the computer, yes: Undo takes back your last tile, along with anything the computer played after it, as long as nobody has drawn from the boneyard since. Drawn tiles can't be put back. In friend games every move stands.

Yes. It marks the tile and the end the strong computer would choose and tells you why. You get 6 hints per game, and asking again about the same move doesn't use another one.