🔧 Step-by-Step Answer Walkthrough For Easy Level
The equals constraint on column 2, rows 2–3 demands that both cells share the same pip value. That means the domino placed there must show the same number on each end — a double. Among the five dominoes in today's easy puzzle, the only double is [3–3]. Place it vertically in column 2, rows 2–3. Both cells are now fixed at 3.
The sum-of-2 region covers cells at row 5, col 0 and row 5, col 1. The [5–1] domino must cover the left column, rows 4–5. The greater-than-3 constraint on row 4, col 0 forces the 5 to sit at the top, leaving 1 at the bottom (row 5, col 0). To hit the sum target of 2, row 5 col 1 must also equal 1. The [0–1] domino runs horizontally across row 5, cols 1–2, with 1 at col 1 and 0 at col 2. Both constraints are now satisfied.
Two dominoes remain: [4–3] and [6–3]. Cell row 1, col 4 carries a less-than-5 constraint. Placing [4–3] vertically at column 4, rows 0–1 puts 3 at the top (row 0) and 4 at row 1 — the value 4 satisfies less-than-5. The final domino [6–3] runs horizontally in row 0, cols 2–3, with 6 at col 2 and 3 at col 3. The equals region at row 0, cols 3–4 confirms both cells show 3. All constraints satisfied.
🔧 Step-by-Step Answer Walkthrough For Medium Level
The equals constraint covers four cells on the right side: row 0 col 5, row 1 col 5, row 2 col 4, and row 2 col 5. All four must share the same value. The [3–3] double placed vertically at column 5, rows 1–2 fills two of them with 3. That forces the remaining two cells — row 0 col 5 and row 2 col 4 — to also equal 3. The [4–3] domino placed horizontally in row 0, cols 4–5 (4 left, 3 right) gives row 0 col 5 = 3. The [5–3] domino placed horizontally in row 2, cols 3–4 (5 left, 3 right) gives row 2 col 4 = 3. Both greater-than constraints at row 1 col 3 and row 2 col 3 are checked: row 1 col 3 is not yet placed, row 2 col 3 = 5 > 4 ✓.
Cells row 3 col 1, row 3 col 2, and row 4 col 2 must all be equal. The [4–4] double placed vertically at column 2, rows 3–4 sets both cells in column 2 to 4. So row 3 col 1 must also be 4. The [2–4] domino placed horizontally in row 3, cols 0–1 (2 at col 0, 4 at col 1) satisfies this. Cell row 3 col 0 is an empty constraint, so the value 2 there is unconstrained — that works.
The sum-of-3 region covers row 4 col 0, row 5 col 0, and row 5 col 1. The [1–1] double placed vertically at column 0, rows 4–5 contributes 1 at each cell. Sum so far: 1+1=2, so row 5 col 1 must equal 1. The [3–1] domino placed horizontally in row 5, cols 1–2 (1 at col 1, 3 at col 2) delivers exactly that. The single-cell sum-of-3 constraint at row 5 col 2 is also satisfied: that cell equals 3 ✓.
Only the [6–4] domino remains. It fits vertically at column 3, rows 0–1 (6 on top at row 0, 4 at row 1). Check: the sum-of-10 region at row 0, cols 3–4 reads 6+4=10 ✓. The greater-than-3 constraint at row 1 col 3 reads 4>3 ✓. All regions satisfied — grid complete.
🔧 Step-by-Step Answer Walkthrough For Hard Level
The sum constraint at row 5, cols 1–3 has a target of 17. With each cell capped at 6, the only combination that reaches 17 is 6+5+6. The [5–6] domino must cover row 5 col 1 (value 6) — placed vertically at col 1, rows 4–5, with 5 at row 4. The single-cell sum-of-5 constraint at row 4, col 1 confirms (5 = 5) ✓. The [5–2] domino placed vertically at col 2, rows 5–6 puts 5 at row 5 and 2 at row 6 — satisfying less-than-3 at row 6 col 2 (2 < 3) ✓. The [6–3] domino placed vertically at col 3, rows 4–5 puts 6 at row 5 (completing the sum) and 3 at row 4 — satisfying less-than-4 at row 4 col 3 (3 < 4) ✓.
Cell row 1 col 1 must be less than 5. The [3–5] domino placed horizontally at row 1, cols 1–2 puts 3 at col 1 (satisfying < 5) and 5 at col 2. Cells row 1 cols 2–3 must sum to 10: (1,2)=5, so (1,3) must equal 5. The [5–4] domino placed vertically at col 3, rows 1–2 puts 5 at row 1 and 4 at row 2. Single-cell sum-of-4 at row 2 col 3: 4 = 4 ✓. Cell row 4 col 6 must be greater than 3 — the [6–6] double placed horizontally at row 4, cols 5–6 puts 6 at both cells, satisfying that ✓.
Cells row 2 col 1, row 3 col 1, and row 3 col 2 must all be equal. The [1–1] double placed horizontally at row 3, cols 1–2 sets both to 1. So row 2 col 1 must also be 1. The [1–5] domino placed horizontally at row 2, cols 0–1 puts 1 at col 1 and 5 at col 0 — satisfying the equals region ✓. Cell row 2 col 0 is an empty constraint, so value 5 is fine.
The [5–0] domino placed vertically at col 5, rows 1–2 puts 0 at row 1 and 5 at row 2. Greater-than-2 at row 2 col 5: 5 > 2 ✓. The [2–0] domino placed vertically at col 4, rows 0–1 puts 0 at row 0 and 2 at row 1. Sum-of-2 region at rows 0–1, col 4 and row 1 col 5: (0,4)=0 + (1,4)=2 + (1,5)=0 = 2 ✓. The [6–4] domino placed horizontally at row 3, cols 4–5 puts 6 at col 4 and 4 at col 5. Greater-than-3 at row 3 col 4: 6 > 3 ✓. Unequal constraint at row 3 col 5 and row 4 col 5: 4 ≠ 6 ✓. Grid complete.
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