Pips Puzzle — Complete Rules and Strategy Guide
The Pips puzzle is a domino logic game that combines placement with arithmetic. You get a small board divided into coloured regions and a tray holding exactly the dominoes needed to cover every open cell. Several dominoes start pre-placed and locked in outline — those givens never move, and they anchor the whole deduction. Each region carries a constraint written in plain sight — a target sum, an "all equal" rule, a "less than" or "greater than" bound, or "all different" — and your job is to arrange the dominoes so that every one of those constraints is satisfied at the same time. Pieces can be rotated and flipped, so a 3-4 domino works wherever a 4-3 would, and either half can land on either cell.
Pips Rules in Five Lines
- Cover the board. Every cell must be covered by exactly one half of a domino, and every domino must be placed.
- Sums. "Sum = 12" means the pips of all cells inside that region add up to exactly 12.
- All equal / all different. "All equal" means every cell in the region holds the same number. "All different" means no two cells repeat.
- Less than / greater than. The region total must be strictly below, or strictly above, the stated number.
- Rotate and flip. A domino may lie horizontally or vertically, and its two values may be swapped. Blank regions carry no constraint.
How the Pips Generator Works
This is a derive-from-solution generator, and it runs entirely in your browser. Step one places a random valid set of dominoes onto the board, shuffling orientations and flips as it goes. Step two reads the resulting pip values and turns them into region constraints: the sum becomes a "sum equals" target, a region where all values already match becomes an "all equal" rule, and regions with varied values become "all different". Because the constraints are read straight off a real solution, the board is solvable by construction. Step three then hands the board to an independent solver that counts how many valid arrangements satisfy every constraint. Only boards with exactly one solution are kept; everything else is thrown away and regenerated.
Choosing Your Difficulty
Unlimited mode offers three sizes. An easy 4×4 board has eight dominoes and is usually finished in a couple of minutes — a great way to learn how each constraint type behaves. A medium 6×5 board adds seven more pieces and starts needing real cross-referencing between regions. A hard 6×6 board has eighteen dominoes, more regions and more blank cells, so the tray becomes crowded and trial-and-error gets expensive. The daily Pips puzzle is seeded from the calendar date, which means every player gets the identical board on the same day and the archive stays consistent.
Advanced Pips Tactics
- Read single-cell regions first. A one-cell region with "sum = 6" is already solved — that cell holds 6. Anchor everything else around those fixed values.
- Pair up tight regions. Two adjacent tight regions often share a domino. If one forces a 4 and the other needs a 2, only pieces carrying those values can straddle the border.
- Track the tray as inventory. Write down which values are already used. A region that needs a 5 when no 5 remains in the tray is a contradiction — undo immediately.
- Exploit parity. A domino covering two cells contributes both its values, so a region needing an odd total with an even cell count needs specific odd-even pairings.
- Save "less than" for last. Bounds are loose constraints. Verify them only when a region is otherwise complete, so they act as a final check rather than a guide.
Why Play the Pips Puzzle Unlimited?
One daily Pips puzzle is a lovely ritual but a slow teacher. Unlimited mode turns this into a practice range: pick a size, press New Puzzle, and get a fresh board with fresh regions and a fresh tray, each verified to have exactly one solution. The more boards you clear, the faster you read constraint types and the rarer blind trial-and-error becomes. Everything here is free, needs no account, downloads nothing, and works on any screen size — just like the rest of our logic puzzle collection.
