Window is a Decktet solitaire game.

Object of the game: To merge all of the cards into a single pile.

Setup: Deal out nine cards face down, in a three by three grid. Deal nine more cards face down on top of those. Do it again, so that you have nine stacks of three cards each. Finally, deal one card face up onto each of the stacks.

Play: Move the cards around in certain ways to get all the cards into 2 pile to win.

Game Rules:
Window at the Decktet website