🔧 Step-by-Step Answer Walkthrough For Easy Level
Look at the orange equals region on the right edge. Its upper cell has only one neighbour anywhere on the board — the cell directly beneath it — so whichever domino covers that upper cell also covers the lower one, which means the pair is filled by a single domino standing vertically. Equal pips on both halves force a double, and it is the 0/0 double that goes in here: 0 in the upper cell, 0 in the lower cell.
The green sum-2 cell in the bottom-right corner demands an exact total of 2, so the pip sitting in it must be 2. Scan the tray: only the 2/5 tile carries a 2, and that corner cell touches just one other cell, the right half of the blue sum-8 pair above it. So the 2/5 tile stands vertically, 2 in the green cell at the bottom and 5 up in the right cell of the blue pair.
Blue's two cells must total 8 and the right one already holds 5, so the left cell reads 3. Three tiles remain — the 4/4, the 1/4 and the 6/3 — and only the 6/3 carries a 3, so it is committed. Its only open neighbour is the cell above, in the centre teal sum-10 pair, so the tile stands vertically: 3 in the left cell of blue, 6 up in the right cell of the centre pair.
The centre pair totals 10 and already shows 6 on the right, so its left cell reads 4. That cell can only pair with the pink cell above it, and the value there has to match the rest of pink — the 4/4 double delivers exactly that, standing vertically with 4 in the left cell of the centre pair and 4 in the right cell of the pink equals pair at the top-left. Pink's left cell must then read 4 too, and the only tile left is the 1/4: it stands vertically, 4 in the left cell of pink and 1 above it in the purple less-2 cell at the top-left corner, where 1 satisfies the less-than rule. Every region checks out — both equals pairs match, the sums hit 10, 8 and 2, and the corner cell sits under its limit.
🔧 Step-by-Step Answer Walkthrough For Medium Level
The orange single cell in the top-right corner is a sum-0 region, and one cell can only total zero by holding a 0. The tray contains exactly one 0, on the 0/4 tile, so that domino is spoken for. Its partner pip has to go next door, and the roomy target is straight down: the tile stands vertically with 0 in the orange cell and 4 in the top-right cell of the blue greater-18 block beneath it.
Blue needs its four cells to beat 18, and with 4 already in the top-right cell the other three must supply at least 15 between them. The 4/5 tile is the strongest vertical pair left, so it stands upright in the left column of the block: 4 in the top-left blue cell, 5 in the middle-left blue cell. The 3/6 tile then lies flat along the bottom, 6 in the bottom-left blue cell and 3 slipping across into the bottom-left cell of the green block.
Green is a three-cell block that must stay under 8, and it already holds 3 from the 3/6 tile, so its other two cells must total 4 or less. The tray's small pips sit together on the 1/3 tile, and it fits neatly across the top row of green: 3 in the top-left cell, 1 in the top-right cell. Green now totals 3 + 3 + 1 = 7, safely under the limit — and note that the top-right green cell has no other neighbour, so that tile could not have gone anywhere else.
The teal three-cell block has to beat 10. The 5/3 tile stands vertically down its left side, 5 in the top-left teal cell and 3 in the bottom-left teal cell. That leaves the top-right teal cell, whose only free neighbour is the pink cell above it: the 4/3 tile stands vertically, 3 in the top-right teal cell and 4 up in the pink sum-4 cell, which needs exactly a 4. Teal now reads 5 + 3 + 3 = 11, just past its target.
One tile is left, the 4/1, and exactly two cells are still empty: the purple greater-1 cell at the top-left and the uncoloured free square beside it, since that square's other neighbours were already taken by the teal and pink tiles. The 4/1 lies flat, 4 in the purple cell — comfortably above 1, where the 1 would have failed — and 1 in the unconstrained square to its right.
🔧 Step-by-Step Answer Walkthrough For Hard Level
The teal equals block at the bottom-right is four cells that must all show the same pip. It cannot be covered by two dominoes that both sit inside the block: two vertical dominoes down its columns, or two horizontal ones across its rows, would each have to be a double, and that would mean two identical doubles in the tray — which does not exist. So one column of the block is covered by a single double standing vertically, and the other column's two cells are fed from outside: the top-right cell from the cell above it in the blue sum-1 pair, the bottom-right cell from the green greater-14 run below.
That blue sum-1 pair on the right edge must total 1, so its two cells are 0 and 1 — and since no tile in the tray carries both a 0 and a 1, the pair is fed by two separate tiles. The upper blue cell's tile also covers the orange greater-4 cell above it, so it has to pair the 0 or 1 with a pip bigger than 4. The 1/5 tile answers that: it stands vertically with 1 in the upper blue cell and 5 up in the orange cell. (The 0/5 tile would put 0 there and force the block's repeated pip to be 2, but every 2 in the tray — the 1/2, the 2/2 and the 2/4 — is needed for the block and for the lone sum-2 cell in the bottom-left, so that route runs out of pips.)
With 1 in the upper blue cell, the lower one must be 0, and its tile also reaches down into the block: the 3/0 tile stands vertically with 0 in the lower blue cell and 3 in the top-right cell of the teal block. Since all four cells of that block match, teal's repeated pip is 3. The block's left column is filled by the 3/3 double standing vertically — 3 in the top-left cell, 3 in the bottom-left cell.
The block's bottom-right cell still needs a 3, and its only free neighbour is the cell below it in the green greater-14 run. The 6/3 tile stands vertically there: 3 up inside the block, 6 down in the right cell of the run, giving it one big pip towards its target. The 4/5 tile then lies flat across the rest of the run, 5 in the left cell and 4 in the middle cell, so the run totals 5 + 4 + 6 = 15, just over 14.
The purple equals run along the top is four cells reading one repeated pip, and it takes three tiles to do it. The 1/1 double lies flat across its two right-hand cells, supplying two matching pips at once; the 1/2 tile stands vertically with 1 in the run's middle cell and 2 below it in the teal sum-8 block; the 1/3 tile stands vertically with 1 in the run's left cell and 3 below it in the pink sum-7 block. All four cells of the run now read 1, and the two blocks beneath get their small pips.
Pink sum 7 takes the 0/4 tile standing vertically — 4 in its top-left cell, 0 in its bottom-left cell — alongside the 3 the 1/3 tile already dropped in, for 4 + 3 + 0 = 7. Teal sum 8 takes the 2/4 tile lying flat across its bottom row, 2 in the bottom-left cell and 4 in the bottom-right, next to the 2 from the 1/2 tile, for 2 + 2 + 4 = 8. The two single-cell sum-4 regions on the left are bridged by the 4/4 double standing vertically between them: 4 in the upper purple cell, 4 in the pink cell below it. The green sum-7 column finishes with the 0/5 tile standing vertically, 5 in its top cell and 0 in the middle cell, and the 2/2 tile lying flat at the bottom of the grid, 2 in the column's lowest cell and 2 across in the orange sum-2 cell. Finally the bottom row's blue greater-9 pair takes the 4/6 tile lying flat, 4 left and 6 right, totalling 10.
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