🔧 Step-by-Step Answer Walkthrough For Easy Level
The teal sum-4 pair in the bottom-right corner is exactly two cells wide, which means a single domino has to satisfy it alone. Run through the tray looking for a tile whose pips add to four and there is only one candidate: the 2/2 double. Lay it flat across the pair.
Now look at the orange less-3 cell on the bottom-left edge. It is a single square whose only constrained neighbour is the lower half of the purple sum-9 vertical pair, so the tile covering it must carry one pip under three into the orange cell and a much larger pip into the purple pair. Scanning what is left, only the 0/6 tile offers a low pip and a high pip on the same domino — place it flat, 0 on the left in the orange cell and 6 on the right in the lower purple cell.
The purple sum-9 vertical pair now holds a 6 at its base, so its upper cell needs exactly three. The 3/6 tile is the only remaining source of a 3, and its 6 has to go somewhere adjacent — the natural home is the bottom-left corner of the pink sum-9 block immediately to its right. Lay the tile flat across the middle row: 3 on the left in the upper purple cell, 6 on the right in the pink block.
The pink block is a four-cell sum-9 and it already carries a 6, so its three remaining cells must total three — three 1s, and nothing else fits. The 1/1 double lies flat across the two lower cells, bottom-centre and bottom-right, and the 2/1 tile lies flat along the top so its 1 drops into the block's top-centre cell while its 2 sits in the uncoloured square to the left. Every tray tile is now used and all five constraints check out.
🔧 Step-by-Step Answer Walkthrough For Medium Level
The green greater-5 cell in the bottom-right corner is a single square, so it needs the biggest pip available — a 6. Which 6, though? The 6/6 double is needed intact for the bottom-left equals triple, and the 1/6 tile would strand its 1 beside the orange sum-9 pair, which needs a partner that can reach nine. That leaves the 5/6 tile: it lies flat, 5 on the left in the lower half of the orange pair and 6 on the right in the green cell.
The orange sum-9 vertical pair at the bottom now has a 5 in its lower cell, so the cell above it must be 4. The 5/4 tile supplies exactly that — lie it flat across the middle row with 5 on the left in the blue sum-9 block and 4 on the right in the upper orange cell.
The purple less-3 run of three along the very top has to stay as small as the tray allows. The only tiles that can put repeated tiny pips on adjacent cells are the 0/0 double and the 0 half of the 0/3 tile, so those two fill the run. The 0/3 tile stands vertically at the left end with its 0 in the run's left cell and its 3 dropping into the blue sum-9 block below; the 0/0 double lies flat across the run's middle and right cells.
With the zeros spent at the top, the bottom-left equals triple has no choice but to be three sixes. The 6/6 double lies flat across the block's bottom-left and bottom-right cells, and the 1/6 tile stands vertically so its 6 fills the block's top cell while its 1 rises into the blue sum-9 block — the 1 that blue was waiting for.
Blue already holds a 1 and a 5, so its third cell takes the 3 that the 0/3 tile dropped in — nine exactly. Orange holds 4 and 5 — nine exactly. The only region still bare is the teal equals vertical pair on the right edge, and the only double still unused is 4/4, so it stands vertically, 4 up and 4 down. All seven tiles placed, all six constraints satisfied.
🔧 Step-by-Step Answer Walkthrough For Hard Level
Three separate regions on this board sum to zero, and a single pip of zero is the only thing that satisfies them: the orange sum-0 in the top-right corner, the green sum-0 near the centre, and the teal sum-0 down in the bottom-left. Sweep all sixteen tiles and exactly three contain a zero — the 0/3, the 4/0 and the 0/5. Each sum-0 cell claims one of those three tiles, and every other placement on the board has to work around that.
The orange sum-0 corner cell has a single constrained neighbour, the teal less-4 cell immediately to its left. The tile covering the corner must push its other half into that neighbour, and that half has to stay under four. Only the 3 of the 0/3 tile qualifies, so the tile lies flat on the top row: 3 on the left in the teal less-4 cell, 0 on the right in the orange corner.
The green sum-0 cell near the centre touches the pink greater-8 pair above it and the teal less-5 cell below it. A 4 slides comfortably under five; the 5 from the other zero-tile would satisfy neither neighbour. So the 4/0 tile stands vertically, 0 up in the green cell and 4 down in the teal less-5 cell. The 0/5 tile is therefore left for the bottom-left teal sum-0 cell, and it stands vertically too — 0 down in the sum-0 cell, 5 up in the uncoloured square above it.
The purple sum-3 block in the upper right must reach exactly three across three cells, and every zero in the tray is now committed elsewhere. The only shape that lands on three is 1+1+1, so the block takes the 1/1 double and the 1 half of the 1/5 tile. The double stands vertically, 1 up in the block's top-left cell and 1 down in its bottom cell; the 1/5 tile lies flat, 1 left filling the block's third cell and 5 right in the upper cell of the top-right pink greater-7 pair.
That 5 in the top-right pink greater-7 pair already leaves the pair needing to beat seven, so its lower cell takes the 3 from the 2/3 tile, which stands vertically and drops its 2 into the right cell of the blue sum-6 pair below. Blue now needs 4 in its left cell, and the 2/4 tile supplies it while lying flat — 2 on the left at the top of the orange equals column, 4 on the right in the blue pair. The equals column repeats that 2 down the right edge, so the 2/2 double stands vertically beneath it, filling the middle and lower cells.
The green equals pair in the bottom-left must be a double, and the only one left is 5/5, standing vertically, 5 up and 5 down. The blue less-4 pair takes the 1/2 tile vertically (1 up, 2 down, totalling three), the purple less-5 pair takes the 3/1 tile vertically (1 up, 3 down, totalling four), and the top-left purple greater-6 pair takes the 3/4 tile lying flat with 3 left and 4 right. The pink greater-8 pair at the top grabs the highest remaining tile, 5/6, standing vertically with 5 up and 6 down, and the bottom-right pink greater-7 pair takes 3/5, standing 3 up and 5 down. The orange sum-6 single on the bottom row can only be the 6 half of the 1/6 tile, lying flat with 1 to its right in the uncoloured square; and the blue greater-1 cell at the bottom takes the 4 from the 4/1 tile, standing vertically with the 1 above it in its uncoloured square.
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