Spider solitaire deals two full decks — 104 cards — across ten columns, and asks you to untangle them into eight complete King-to-Ace runs. There are no foundations to build and no waste pile to cycle: everything happens on the board, which is why Spider is often called the thinking player's solitaire.
Choose your difficulty before you deal: 1 suit to learn the flow, 2 suits for a real game, or the full 4-suit spread if you want the cards to fight back. Unlimited undo and hints are free, and your game saves automatically.
Spider blocks the deal while any column is empty. Place at least one card on every empty column, then click the stock again.
Start with 1 suit until you win regularly, then move up to 2 suits — that is where most players settle. Four suits is a serious challenge where many deals cannot be won at all.
Only descending runs in a single suit move as a group. A sequence that mixes suits is legal to build but must be taken apart one card at a time.
Every completed King-to-Ace run you clear off the board is worth 100 points, every move you make costs 1, and finishing adds whatever is left of a 1,000-point time bonus. That scoring is the quickest honest measure of whether you are improving: a tidy 150-move win beats a lucky 350-move one, and the counter in the header tells you which kind of game you just played.