Spider Solitaire uses two standard 52-card decks (104 cards). Goal: Build 8 foundation stacks (King → Ace) in same suit. Most common: 4-Suit (hardest), 2-Suit, 1-Suit (easiest).
No legal moves + stock exhausted + no empty columns to accept a deal.
Digital Note: Windows Spider (XP/7) uses 2-suit default. Microsoft Solitaire Collection (Win10/11) offers 1/2/4 suit. No official "tournament rules" body – these are the de facto standard from Microsoft implementation.