🔧 Step-by-Step Answer Walkthrough For Easy Level
Region [2,1]+[2,2] must be greater than 11. The maximum pip on any domino face is 6, and 6+6=12 is the only pair that clears the threshold. Both bottom cells are 6.
There's no 6-6 double in today's set, so the two sixes belong to separate pieces. The 6-0 domino runs vertically at [2,1][1,1], putting 6 in the lower cell and 0 above it. The 2-6 domino runs vertically at [1,2][2,2], putting 2 in the upper cell and 6 below.
The equals constraint links [0,2] and [1,2]. With [1,2] now set to 2 from the previous step, [0,2] must also carry a 2. Both cells are confirmed.
The top row holds two horizontal dominoes laid side by side. The right pair covers [0,2] and [0,3]. With [0,2]=2 established, the other half at [0,3] must be less than 4. The 3-2 domino fits cleanly: 2 at [0,2] and 3 at [0,3]. Three is less than four — constraint satisfied.
The 2-5 domino is all that remains. It fills [0,0] and [0,1], and cell [0,0] must be greater than 4. Placing 5 at [0,0] satisfies that requirement, with 2 landing at [0,1]. The puzzle is complete.
🔧 Step-by-Step Answer Walkthrough For Medium Level
The equals region [3,2]=[4,2] covers two vertically adjacent cells that must match. The only domino in the set with two identical pip values that can span those cells is the 2-2 double — place it vertically at [3,2][4,2], setting both cells to 2.
Cell [4,3] must exceed 4, so it holds a 5 or 6. The domino that covers [4,3] connects upward to [3,3]. The 1-5 piece works: place it vertically at [3,3][4,3] with 1 at [3,3] and 5 at [4,3]. That 5 clears the greater-than-4 requirement.
The equals region [2,3]=[3,3] requires [2,3] to match [3,3]=1. The 3-1 domino fits horizontally at [2,2][2,3] — 3 at [2,2] and 1 at [2,3]. Then the equals region [1,2]=[2,2] requires [1,2] to match [2,2]=3. The 3-3 double drops horizontally at [1,1][1,2], setting both cells to 3.
Region [0,1]+[1,1] must equal 3. With [1,1]=3 already in place, [0,1] must be 0. The 0-0 double fills [0,0][0,1] horizontally — 0 at both cells, satisfying the sum constraint.
Region [0,4]+[1,3]+[1,4] must sum to 12. The 0-6 domino delivers 6 at [1,3] and 0 at [1,4], contributing 6 to the region's total. That means [0,4] must supply the remaining 6. The 5-6 domino goes horizontally at [0,4][0,5] with 6 at [0,4] and 5 at [0,5]. Cell [0,5]=5 satisfies the greater-than-4 constraint. Sum check: 6+6+0=12.
🔧 Step-by-Step Answer Walkthrough For Hard Level
Three cells carry absolute constraints with no ambiguity. Cell [1,0] must be 1 (sum=1). Cells [7,3] and [7,6] must each be 5 (sum=5 each). Record all three before placing anything — they each determine a domino immediately.
Region [3,8]+[4,8]+[5,8] must sum to 18. Three cells, max pip of 6: the only solution is 6+6+6. The 6-6 double covers [4,8][5,8]. The 2-6 domino places 6 at [3,8] and 2 at [3,7]. All three right-column cells are now set.
Cell [6,6] must be less than 2 — so 0 or 1. With [7,6]=5 established, the 0-5 domino fits vertically at [6,6][7,6]: 0 at [6,6] and 5 at [7,6].
With [7,3]=5, place the 5-6 domino vertically at [7,3][6,3]: 5 at [7,3] and 6 at [6,3]. Now region [4,3]+[5,3]+[6,3] sums to 15 with [6,3]=6 contributing — so [4,3]+[5,3] must equal 9.
Region [3,6]+[3,7] must sum to 8. With [3,7]=2 placed earlier, [3,6]=6. The 3-6 domino goes vertically at [4,6][3,6]: 3 at [4,6], 6 at [3,6]. Region [4,6]+[5,6] must sum to 7: with [4,6]=3, [5,6]=4. The 2-4 domino goes horizontally at [5,5][5,6]: 2 at [5,5], 4 at [5,6]. Region [5,4]+[5,5] must sum to 4: with [5,5]=2, [5,4]=2. The 2-5 domino goes horizontally at [5,4][5,3]: 2 at [5,4], 5 at [5,3]. Single-cell [4,4]=3, so the 3-4 domino goes horizontally at [4,4][4,3]: 3 at [4,4], 4 at [4,3]. Sum check for column 3: 4+5+6=15.
Region [2,4],[3,2],[3,3],[3,4] must all carry the same value. Cells [3,3] and [3,4] are adjacent — the only unused double that works here is the 0-0 domino, placing 0 at both. With the shared value established as 0, [3,2]=0 and [2,4]=0 follow. The 0-4 domino goes vertically at [3,2][2,2]: 0 at [3,2], 4 at [2,2]. The 0-1 domino goes horizontally at [2,4][2,5]: 0 at [2,4], 1 at [2,5].
Region [2,5],[3,5],[4,5] all equal the same value. With [2,5]=1 just placed, all three cells are 1. The 1-1 double goes vertically at [3,5][4,5]. With [1,0]=1, the 1-2 domino goes vertically at [1,0][2,0]: 1 at [1,0], 2 at [2,0]. Region [2,0]+[2,1]+[2,2] must sum to 8: with [2,0]=2 and [2,2]=4, [2,1] must be 2. The 2-3 domino goes vertically at [2,1][1,1]: 2 at [2,1], 3 at [1,1]. The equals region [0,2],[1,1],[1,2] must all be 3. With [1,1]=3, [0,2] and [1,2] are both 3. The 3-3 double goes vertically at [0,2][1,2], completing the puzzle.
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