Spider's a classic column based solitaire card game. Your goal is to try and build down the columns from King to Ace. You can just ignore the suits. Some versions have only spades or a single suit, but that's not really necessary. If you play with a deck of cards you would just ignore the suit, which is what this version of the game is like. When you click the deck an additional card is added to each column. You can move the top card in every column, or you can move a fully packed series of cards. I've dimmed all the cards you can't move to make it easy to figure it out.