Quantum Solitaire

Quantum Solitaire is a single-player patience game where hidden cards aren't simply unknown, they're in superposition, a live cloud of every card they could still be. Select a face-down tile to read its odds (the chance it's red, the chance it's playable right now), then click again to collapse it into a real card. You commit the flip before the reveal, so each decision is a calculated gamble. Build the tableaus down in alternating colours and the foundations up by suit from Ace to King to win.

• Tableaus build downward in alternating colours; foundations build upward by suit, Ace to King.
• Click a "??" tile once to inspect its probabilities, again to collapse it to a concrete card.
• Move known cards by clicking the source then the destination; double-click to send a card home.
• Draw-one stock, unlimited undo, and an Auto-Finish button that sends every safe known card home.

• Desktop: click to select and place cards, double-click to send a card to its foundation, and use the Undo, Auto-Finish, Daily and Practice buttons.
• Phone & tablet: tap to select, inspect odds and place cards; a mouse or trackpad is comfortable for the double-click-home shortcut.

• Daily: a shared seeded deal everyone plays the same day.
• Practice: endless fresh deals on demand.

• Read the odds panel before every commit, a tile with high "playable here-or-home" probability is a far safer flip than a blind gamble.
• Lean on unlimited undo to test a risky collapse, then back out if it sours.
• Hold Auto-Finish until late; sending cards home too early can strip moves you needed for a stuck column.

Quantum Solitaire is an original free browser card game that fuses traditional patience with probability: instead of hidden cards you can only guess at, you get the real odds and the nerve to commit. No download or account required.

A free, original browser game on PlayPendium. No download, no install.