MODE / FREE PLAY
REACTOR READY
EXPOSED PAIRS MUST EQUAL THIRTEEN
RESERVECycle 1 · ∞
REACTION
? + ? = 13
Find your first pairTap two available cards totaling 13.
All 28 pyramid cards have been converted. A perfectly balanced little universe.
This is classic Pyramid Solitaire with a different interface. Each card has a value: Ace = 1, Jack = 11, Queen = 12 and King = 13. Two uncovered cards summing to 13 disappear; a King disappears on its own.
Cards are uncovered only when neither of the two cards directly beneath them remains. Tap an exposed card to illuminate its possible partners. The reserve's top face-up card can also be paired, or a King can be removed. Recycle the reserve whenever empty in Flow mode, or up to three total reserve passes in Focus mode.
Goal: Remove all 28 cards from the pyramid. Undo, hints, and restarting are always available. Not every shuffled deal is winnable.
Play free Pyramid Solitaire online: pair exposed cards that total 13, clear the 28-card pyramid, and choose relaxed or three-pass reserve mode.
THIRTEEN / ATOM is a Pyramid Solitaire card game. Remove cards from a 28-card pyramid by pairing available cards whose values add to 13; Kings count as 13 and clear on their own.
Start a free-play deal, try the daily deal, or choose a more constrained reserve challenge for a quick arithmetic-and-planning card puzzle.
Pyramid Solitaire fans and casual puzzle players who enjoy spotting valid pairs and planning around cards that are still covered.
Choose a random or daily deal and switch between Flow mode, with unlimited reserve cycles, and Focus mode, limited to three cycles. Sound is optional.
The game tracks cards cleared, actions, score, and elapsed time. It saves the current game on this device in browser storage; no account or connection is needed.
Not every shuffled deal is winnable. This is a local, single-player browser game; saved progress depends on the current browser’s site data.
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