What are the official game rules of spider solitaire?

Unfortunately, there are hundreds of different kinds of solitaire games. If you tell us the name of the particular solitaire game, we could help more. The basic game that you get free on your computer sometimes (not Spider Solitaire, but the older one called Solitaire) is a game where you try to line up all the cards, black on red, in descending order, and eventually move them all to piles (by suit starting with the aces). There are options about whether you want to draw one or three, and difficulties with either choice. With draw three, it is important to see the second and third cards before you go through the pile three times (when the game ends), and with either option it is a major challenge to get access to the cards that are face-down. To do this, you have to move one of the face up cards on the top of the face-down card to another pile (so, a black Jack to a red Queen or a red 4 to a black 5 for instance). Hope that was the one you were asking about, but if not, check for rules specific to the name online, or ask another question here giving more of a description.