52 cards: seven columns of 1 to 7 cards, only the last one face up; the rest is the stock, face down.
Tap the stock to turn one card onto the waste (three, if you chose it). When the stock is empty, tap it to turn the waste over again.
On the columns, build down in alternating colours: a red 6 on a black 7. A face-up run moves together. An empty column takes only a King.
Build the four foundations up by suit, from the Ace to the King. A card that fits a foundation goes up there with a tap; anywhere else, drag it, or tap it and then tap the place.
You win when all 52 cards are on the foundations: 75 chips. Undo takes back the last move, 3 times in a game.
A game needs a stake of 50 chips. When no move is left that changes anything, the game ends by itself and the stake is lost; leaving before the end loses it too.
Wins pay up to 500 chips a day (losses do not count); after that you play without stake and without win, and the chips come back at midnight.
Daily win limit: the games pay up to 1500 chips of wins a day, all of them together. The win that reaches it is paid in full; after it you can go on playing as usual for fun, and the chips come back the next day.