#two-deck

Busy Aces is a two-deck solitaire game with a 65% win rate, played with 104 cards. Twelve tableau piles each start with one card, and eight foundation piles build up by suit from Ace to King. Players draw from the stock to a waste pile, building tableau piles down by suit with no redeal permitted.

Double Klondike is a two-deck Klondike variant with a 55% win rate, played with 104 cards. Cards are dealt into nine tableau columns of increasing length, and the goal is to build eight foundation piles from Ace to King by suit. Build tableau sequences down in alternating colors and draw from the stock when stuck.

Forty Thieves is a two-deck solitaire game with only a 10% win rate, dealing 40 cards face-up into ten tableau columns. Players build eight foundation piles from Ace to King by suit, moving one card at a time in same-suit descending sequences. It is among the most difficult classic solitaire variants.

Spider is a challenging solitaire card game with an 8% win rate in four-suit mode, played with two decks totaling 104 cards. Cards are dealt into ten tableau columns. The goal is to build complete descending sequences from King to Ace within a single suit. Completed sequences are removed until all cards are cleared.