Solitaire Clock

Clock Solitaire (also known as Travellers, Hidden Cards, or Four of a Kind) is a purely luck-based solitaire card game where 52 cards are arranged in 13 piles representing the 12 hours of a clock face plus a center pile. The player moves cards to their corresponding clock positions based on their rank. Despite requiring zero strategic decisions, the game has a satisfying visual mechanic and a clean probabilistic structure — exactly 1 in 13 deals is winnable.

Rules

1. Setup: Deal all 52 cards face-down into 13 piles of 4 cards each. Arrange 12 piles in a circle like a clock face (1 o'clock through 12 o'clock) and place the 13th pile in the center (representing the Kings).
2. Start: Turn over the top card of the center (King) pile.
3. Play: Place the revealed card face-up under the pile corresponding to its rank:

• Ace = 1 o'clock
• 2 = 2 o'clock
• 3 through 10 = corresponding hour
• Jack = 11 o'clock
• Queen = 12 o'clock
• King = center pile

1. Continue: After placing a card, turn over the top face-down card from that same pile.
2. Winning: All 52 cards are turned face-up (every pile shows 4 cards of the same rank).
3. Losing: If you turn over the 4th King before all other cards are face-up, the game is over — there are no more face-down cards to draw from the center.

Strategies

Clock Solitaire is entirely determined by the initial deal — there are no decisions to make. However, understanding the game's structure is interesting:

• No Choices: Every move is forced. The player simply follows the rules, turning over cards and placing them.
• Win Condition: The game is won if and only if the 4th King is the last card turned over (i.e., it is at the bottom of the center pile).
• Probability: The probability of winning is exactly 1/13 (approximately 7.7%), because the last card in the sequence is equally likely to be any of the 13 ranks, and only if it's a King do you win.
• Educational Value: The game is excellent for teaching children card recognition, counting, and clock reading.

Clock Solitaire is one of the oldest and simplest patience games, with origins likely in the 18th or 19th century when card patience games became fashionable in Europe. The game appears in numerous early compilations of patience games under various names including "Clock," "Travellers," "Hidden Cards," and "Sundial."

The game's appeal lies not in its strategy (there is none) but in its ritual quality and visual satisfaction. Watching the clock face fill up with neatly organized sets of four-of-a-kind creates a meditative, almost hypnotic experience. The suspense of whether the fourth King will appear too early adds genuine tension to an otherwise mechanical process.

Clock Solitaire has been widely used as an educational tool for children. The clock layout teaches hour positions, card values reinforce number recognition, and the simple mechanical process is easy for young children to follow. Many teachers and parents use it as a first card game for children aged 4-6.

Despite its lack of strategy, the game has been analyzed mathematically. Its exact win probability of 1/13 was proven through combinatorial analysis and makes it one of the few card games whose win rate can be calculated precisely rather than estimated through simulation. Variants exist that add minor decision points, such as "Watch" (which allows choosing between two piles when a card matches) or "Big Clock" (using two decks), but the classic version remains the most played.