Parallels is a solitaire card game which is played with two decks of playing cards. It is so called because the cards are lined up in rows parallel to each other, so to speak.
First, one king and one ace of each suit is removed and the aces and kings are each lined into columns to form the foundations. The aces are built up while the kings are built down all by suit.
Between the two foundation columns, the player deals a row of ten cards, forming the tableau. All of these cards are available for play on the foundations and the spaces they leave behind are immediately filled from the stock.
When play comes to a stand still, a second row of ten cards is dealt below the first row. All cards are still available for play and the spaces left behind are immediately filled from the stock.
When play comes to a stand still a second time, a third row of ten cards is dealt. At this point onwards, the following rules apply:
Also, reversals are allowed in the game, i.e. when the two foundations of the same suit meet at one point, the player can move the cards from one foundation to the other except the base cards (ace and king) of the foundations.
The game ends when play stops after the stock has run out. The game is won when all cards are built into the foundations.