๐ง Step-by-Step Answer Walkthrough For Easy Level
The four-cell equals region at [2,3], [3,3], [4,2], [4,3] must all show the same pip. Only a double-domino can cover two cells with the same value, and weโll need one double to occupy two of these cells while another domino completes the rest with the same pip. The only available double is [2,2], so place it vertically at [2,3] and [3,3] โ both become 2.
Cell [4,4] is under a less-2 constraint, so it must be 0 or 1. The adjacent cell [4,3] must match the equals region value of 2. The only domino that provides a 2 and a number less than 2 is [1,2]. Place [1,2] horizontally: [4,4] gets 1 (satisfying less-2) and [4,3] gets 2, completing the equals blockโs bottom edge.
With [4,3]=2, the equals region demands [4,2]=2. The empty cell [4,1] sits next to it. The [2,3] domino can deliver a 2 and a 3. Place [2,3] horizontally at [4,2] (2) and [4,1] (3) โ this fills the last equals cell and satisfies the empty region with no conflict.
The greater-13 region includes [0,1], [0,2], [1,1] and needs high pips. The [5,1] domino fits beautifully: place it vertically at [1,1] (5) and [2,1] (1) โ the 5 helps the greater-13 total, while [2,1] satisfies its greater-0 constraint. Now [0,5] goes to [0,0] (0) and [0,1] (5), completing the top-left. Finally [3,6] fills the remaining top cells at [0,3] (3, satisfying the sum-3 cell) and [0,2] (6) โ the greater-13 total becomes 5+6+5=16, well above 13.
๐ง Step-by-Step Answer Walkthrough For Medium Level
The equals region [1,2]โ[1,3] both must have the same pip. Among available dominoes, only the [0,0] double can sit naturally here. Place it horizontally: [1,2]=0, [1,3]=0.
The sum-3 region [1,0]โ[1,1] needs a total of 3. With [1,1] not yet filled, we check dominoes that can reach it. The [1,4] domino can place 1 at [1,0] and 4 at [2,0] (vertical), which would force [1,1]=2 to reach sum 3. The [0,2] domino then fits horizontally at [0,1] (0) and [1,1] (2) โ completing the sum and filling the empty cell [0,1].
The equals region [2,0]โ[3,0] forces [3,0] to match [2,0] (which is 4). The [4,5] domino contains a 4; place it horizontally at [3,0] (4) and [3,1] (5), filling both the equals region cell and the empty [3,1].
Cell [2,1] requires a value greater than 2. The [6,2] domino fits perfectly: vertical placement at [2,1] (6) and [2,2] (2). Now the sum-3 region [2,2]โ[3,2] has [2,2]=2, so [3,2] must be 1. The double [1,1] can cover that and its neighbor: place [1,1] horizontally at [3,2] (1) and [3,3] (1).
The sum-3 region [2,3]โ[3,3] now has [3,3]=1, so [2,3] must be 2. The [2,2] domino (the only remaining domino) goes horizontally at [2,3] (2) and [2,4] (2). This satisfies sum-3 and the greater-0 cell [2,4] with a safe 2, completing the grid.
๐ง Step-by-Step Answer Walkthrough For Hard Level
Cell [3,2] is a standalone sum-6 region, so it must contain exactly 6. The only way to place a 6 there is to use a domino with a 6 that can reach it. The equals region [2,1]โ[2,2] requires a double, and the double [6,6] fits nicely: place [6,6] horizontally at [2,1] and [2,2] (both 6). Then the [6,2] domino runs vertically at [3,2] (6) and [4,2] (2).
The sum-6 pair [4,1]โ[4,2] now has [4,2]=2, so [4,1] must be 4. The only remaining domino with a 4 and another number that fits the adjacent [4,0] is [4,2] (pips 4,2). Place it horizontally at [4,1] (4) and [4,0] (2). This satisfies that sum-6 region and sets [4,0]=2.
The sum-6 region [3,0]โ[4,0] now demands [3,0]=4 (since [4,0]=2). The sum-6 region [1,0]โ[2,0] above needs a total of 6. The [5,4] domino (pips 5,4) can be placed vertically at [2,0] (5) and [3,0] (4) โ that supplies 4 to [3,0] and gives [2,0]=5. Then [1,0] must be 1 to complete sum 6, so the double [1,1] goes vertically at [0,0] (1) and [1,0] (1).
The sum-6 region [0,0]โ[0,1] with [0,0]=1 forces [0,1]=5. The [5,3] domino fits horizontally at [0,1] (5) and [0,2] (3). The equals region [0,2]โ[0,3] then forces [0,3]=3. To cover that and the sum-7 region [0,4]โ[0,5], use the double [3,3] horizontally at [0,3] (3) and [0,4] (3). Now the sum-7 pair [0,4]โ[0,5] has 3+[0,5]=7, so [0,5]=4. The [3,4] domino goes horizontally at [0,5] (4) and [0,6] (3), feeding the next sum-7.
The sum-7 region [0,6]โ[1,6] has [0,6]=3, so [1,6] must be 4. The [6,4] domino can be placed vertically at [1,6] (4) and [2,6] (6). The equals region [2,6]โ[3,6] then enforces [3,6]=6. Finally, the [6,0] domino runs vertically at [3,6] (6) and [4,6] (0), satisfying the empty cell [4,6] and completing the puzzle.
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