#hard

Canfield is a single-deck solitaire game with only an 8% win rate, featuring a 13-card reserve pile, four tableau columns, and a stock pile. Foundation piles begin on a randomly chosen rank rather than Ace, and all four suits must build upward from that rank, wrapping from King back to Ace as needed.

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.

Scorpion is a single-deck solitaire game with an 8% win rate across seven tableau columns. The goal is to build four complete King-to-Ace sequences by suit within the tableau itself, with no separate foundations. Any face-up card plus all cards on top may move together when the bottom card matches suit and rank.