#challenging

Accordion is a single-row solitaire game with only a 1% win rate, played with one 52-card deck. Cards are dealt into a line, and players move any card onto the card to its left or three positions left when they share suit or rank. The goal is to compress all 52 cards into one pile.

Calculation is a solitaire game with a 50% win rate using a standard 52-card deck. Four foundation piles are each built by a different numerical interval: by 1s, 2s, 3s, and 4s, wrapping around from King back to Ace. Four waste piles serve as temporary storage while working through the stock.

Eight Off is a strategic solitaire game with a 99% win rate, played with one 52-card deck. Cards deal into eight tableau columns of six, with four pre-placed in free cells. Tableau builds descending same-suit only. Only Kings fill empty columns. Eight free cells provide temporary storage toward four foundations.

La Belle Lucie is a classic patience game with a 10% win rate, played with one 52-card deck. All 52 cards deal into seventeen fans of three, plus one single-card fan. Only the outermost card of each fan is playable. Foundations build Ace to King by suit. Two redeals allowed. Empty fans cannot be refilled.

Seahaven Towers is a strategic solitaire game with a 14% win rate, played with one 52-card deck. Cards deal into ten tableau columns of five, with two pre-placed in free cells. Four free cells hold cards temporarily. Tableau builds same-suit descending. Only Kings fill empty columns.

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.