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The spider solitaire game is played with two decks of playing cards. After thoroughly shuffling both decks together, 4 rows of 10 face down cards are dealt to form the tableau columns. 4 more cards are dealt face down to the 4 leftmost columns and then a face up card is dealt to the end of each column. The remaining cards are placed face down to form the stock pile.
Your layout should resemble the picture below:
Spider is usually played with two standard decks of playing cards, but the game is very difficult that way. Spider One Suit and Spider Two Suit game variations exist that still use 104 cards, but only use the Spades in the one suit game and Spades and Hearts in the two suit game. Extra packs of cards are required to make up the numbers. This makes Spider considerably easier. You may do this to lower the difficulty of the game if you are struggling with it or still learning.