A double-six set, four players, five tiles each. The rest wait face down in the boneyard.
Start: the first hand opens with the highest double at the table. After that the winner of the last hand opens with any tile.
Play: add a tile to either end of the line so the touching ends match. Doubles sit crosswise. If nothing in your hand fits, draw from the boneyard until something does. If the boneyard is empty, pass.
Scoring: the hand ends when someone plays their last tile, or when nobody can move. The winner (the lightest hand, when blocked) scores all the pips left in the other hands. First to 100 wins.
Sounds covers the tile noises, and the slider next to it covers everything. Music plays soft ambient music. Night mode warms the screen for a dark room. Chill mode turns all three on for late nights. Every switch is remembered on this device.