The Windmill is a one-deck patience. The game is begun by dealing four Twos to the tableau and one card to the reserve. The remaining cards form the stock. The waste pile is under the stock.
The object of the game is to build four foundation piles up in suit running from Three to Ace.
You can build tableau piles down in suit. Only the top cards of the tableau are available to play. When the reserve cell is emptied it can be filled with any card. The stock can be reused only once.