Setup
A double-six set (28 tiles) is shuffled; each player is dealt 7. The remaining 14 stay face-down and out of play — this is Block Dominoes, so there's no drawing. Whoever holds the highest double opens with it.
Your turn
Play one tile from your hand onto either open end of the line, matching its pip count. If nothing in your hand fits either end, you pass.
Winning
Empty your hand first and you win outright. If both players pass in a row, the game is blocked — whoever's holding the lower total pip count across their remaining tiles wins that instead.