Spider Solitaire is a classic card game that's widely available on most computer systems, including Windows, macOS, and mobile devices. The objective of the game is to build eight descending sequences of cards, starting from King to Ace. Here's a quick guide on how to play Spider Solitaire:

1. Set up the game by shuffling two decks of cards and dealing out ten piles, with four cards in each pile. The cards should be dealt face down, except for the top cards, which should be turned face up.

2. The remaining fifty cards are kept in stock, which can be found on the upper left-hand corner of the screen.

3. The goal of Spider Solitaire is to make eight descending sequences of cards, starting with King and ending with Ace, in each of the ten piles. An intermediate card must be at the top of each pile.

4. You can move a card from one pile to another if it is one rank lower and of a different color. For example, a red seven can be placed on a black eight.

5. If you're stuck, you can draw cards from the stockpile on the upper left and place them on any of the ten piles, one at a time. If no moves are available, then you can draw three cards at a time. But be mindful that doing so will reduce the number of moves you can make.