I have been trying to try out a new cell variant called the "spilled" cell which must have 8 neighbors. Basically a Spilled cell's value must evenly divide the sum of its 8 neighbors. It seems quite hard to implement it to a nice puzzle, so let's try out the weaker version of the variant.
Normal 4x4 sudoku rules apply.
Thermometer: From the bulb to the tip of a thermometer line digits must strictly increase.
T-Spilled and X-Spilled (Custom Rule): All 4 interior cells of the 4x4 grid must satisfy both the T-spilled and X-spilled rules. A T-spilled cell's value must evenly divide the sum of its 4 orthogonal neighbors. An X-spilled cell's value must evenly divide the sum of its 4 diagonal neighbors.
Puzzle:
How hard can 4x4 sudoku be? (famous last word)
Solution code: Column 2 then Row 2 (8 digits without space)
on 17. August 2025, 22:21 by byale
Quicker solve than I expected. The spilled cell concept is neat!
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