🔧 Step-by-Step Answer Walkthrough For Easy Level
Begin with the purple less-than-4 square in the top-left corner and the blue greater-than-4 square in the bottom-right. Neither pins an exact number yet, but together they fence the board in: the purple cell can only take a small pip, the blue cell can only take a 5 or a 6.
Now the pink equals block running down the left side. The cell just below the top of that column touches only other pink cells — up, down and right are all inside the block — so whatever domino covers it must have two identical halves. Only one double sits in the tray, the 0/0. Stand it vertically inside the block, 0 in the middle-left cell and 0 in the bottom-left cell, and the whole region is fixed at 0.
The teal sum-10 pair across the top of the board needs two pips adding to ten. Among the tiles still available only the 4/6 can manage that. Lay it horizontally, 6 in the left cell and 4 in the right cell of the teal pair.
The two remaining pink cells each need a 0, and they receive them from the mixed tiles. Lay the 0/4 horizontally on the middle row, 0 in the middle-right cell of the pink block and 4 in the left cell of the orange sum-10 pair — whose other half must therefore be a 6. Stand the 5/6 vertically on the right, 6 up in the right cell of the orange pair and 5 down in the blue greater-than-4 square. Last of all, stand the 1/0 vertically in the left column, 1 up in the purple less-than-4 corner square and 0 down into the top-left cell of the pink block.
🔧 Step-by-Step Answer Walkthrough For Medium Level
Start at the top-left. The purple equals region is a two-cell column, and both cells must show the same pip. Of the seven tiles in the tray only one carries two matching halves — the 1/1 — so it stands vertically there, 1 in the upper cell and 1 in the lower one.
Next, the orange sum-4 square on the left edge. It is one cell, so a single pip has to be exactly 4 there. The tile reaching it also fills the uncoloured square beside it, and the 4/5 is the fit: lay it flat on the middle row, 4 in the orange square and 5 in the uncoloured square immediately to its right.
The pink greater-than-9 pair in the centre of the board needs its two cells to total more than nine. Scanning what is left, only one domino can even get there — the 4/6, giving 4 + 6 = 10. Stand it vertically inside the pink pair, 4 in the upper cell and 6 in the lower cell.
The teal less-than-7 block on the right is four cells that must total under seven, so it wants tiny numbers. The unconstrained square at the top-right is the perfect dumping ground for a big pip: stand the 6/0 vertically so the 6 sits in the uncoloured square and the 0 drops into the top-left cell of the teal block. Then stand the 4/1 vertically down the block's right-hand column, 4 in the top-right cell and 1 in the bottom-right cell.
One teal cell is still empty, and the single-cell limits underneath claim the rest. Stand the 2/1 vertically at the foot of the teal block, 1 up in the bottom-left cell of teal and 2 down in the green less-than-3 square at the bottom-right. That leaves the 3/5, which lies flat along the bottom row, 3 in the blue less-than-4 square on the left and 5 in the uncoloured square beside it.
🔧 Step-by-Step Answer Walkthrough For Hard Level
Every constrained square on this board is a single cell with a sum target, and the extreme targets do all the early work. A sum-0 square admits nothing but a 0, and a sum-6 square admits nothing but a 6. Scan for those two kinds first, because each one names a pip outright.
Two of those zeros are neighbours. The blue sum-0 square on the left and the green sum-0 square in the centre of the board share a row and touch edge to edge, so one domino must cover both — the 0/0 lying flat, 0 on the left and 0 on the right.
The same pairing shows up at the bottom of the board: the teal sum-6 square and the orange sum-6 square sit side by side, so the 6/6 lies flat across them. Then take the right edge, where the pink sum-0 square sits directly above a pink sum-6 square — the 6/0 stands vertically there, 0 up in the sum-0 square and 6 down in the sum-6 square.
One 0 is still unplaced. The blue sum-0 square in the centre of the board has a blue sum-2 square directly beneath it, so the 2/0 stands vertically, 0 in the sum-0 square and 2 in the sum-2 square below. All four zeros are now used up.
Every square in the top row is filled by the upper half of a vertical domino, so the targets up there — 1, 1, 2, 2 — are simply the numbers those tiles must show upward. Left to right: the 1/2 puts 1 in the purple sum-1 square with 2 falling into the green sum-2 below it; the 1/3 puts 1 in the pink sum-1 square with 3 falling into the purple sum-3 square on that upper row; the 2/3 puts 2 in the teal sum-2 square with 3 dropping into the pink sum-3 square; and the 2/6 puts 2 in the orange sum-2 square with 6 dropping into the teal sum-6 square on the upper right.
The rest is a matter of fit. Stand the 3/5 vertically on the left edge, 5 up in the blue sum-5 square and 3 down in the uncoloured square, and the 4/1 two rows lower on that same edge, 4 up in the uncoloured square and 1 down in the teal sum-1 square. Stand the 1/6 just inside the left edge, 6 up in the orange sum-6 square and 1 down in the orange sum-1 square. In the upper middle-right the 5/6 stands vertically, 5 up in the pink sum-5 square and 6 down in the purple sum-6 square; in the centre the 3/6 stands vertically, 3 up in the purple sum-3 square in the centre of the board and 6 down in the green sum-6 square; and on the right edge the 1/5 stands vertically, 5 up in the orange sum-5 square and 1 down in the teal sum-1 square. Finally lay the 2/5 flat on the next-to-last row, 2 in the green sum-2 square and 5 in the purple sum-5 square, and the 2/4 flat on the bottom row, 2 in the uncoloured square and 4 in the blue sum-4 square.
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