NEW · PAIR DEDUCTION
Domino Ledger
Every pair, once. Every choice matters.
Join neighboring numbers. Use every pair exactly once.
Drag between two squares, or click both. Arrows move focus · Shift + arrow pairs · U undo.
Pair ledger
✓ means used. Reversed pairs count as the same.
Rules & strategy
Cover every number with one two-square domino. Partners share a side, never a diagonal. Use every pair listed in the ledger exactly once: 1–3 is the same pair as 3–1. Click a joined square to remove its domino.
Look for pairs that have only one possible location. A tempting placement can steal the only location for a different pair. Deep deductions boards still have at least 20 unpaired squares after single-location deductions, so consider how alternatives affect the whole ledger.
36 original, unique-solution puzzles. All packs are open; no timer or lives. Difficulty is based on solver structure, not independent player testing. Daily rotates this bank at 00:00 UTC; refresh for a new day. Progress lasts for this visit.
Rules & example: Domino Ledger
- Join neighboring numbers in two-square dominoes, sharing a side rather than a diagonal.
- Cover every square and use each pair in the ledger exactly once. A reversed pair is the same entry.
- Drag between two squares or click both. Arrow keys move focus; Shift + arrow pairs; U undoes; Delete removes the focused domino.
A quick example
If 1–3 can appear in two places but one of those squares is the only partner for 2–3, reserve that square for 2–3 and place 1–3 elsewhere.
Where to start
36 original, unique-solution boards. Upper packs need reasoning beyond single-location placements. Each wrong pair may block another ledger entry. No timer or lives; unlimited Undo. Daily rotates this bank; progress lasts for this visit.
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36 games