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10 votes

sums and differences in consecutive grid

Very nice puzzle! @WeatherVane beat me to the answer but thought I'd post with some logical deductions: Logic on how to solve:
Beastly Gerbil's user avatar
6 votes

sums and differences in consecutive grid

My solution:
Weather Vane's user avatar
  • 14.5k
1 vote
Accepted

Magic square from specific set of numbers

You want to find a $3\times 3$ matrix with entries in $\{0,1,4,5,6,9\}$, with each row, column, and both diagonals having the same sum. Via integer linear programming I found $14$ solutions, ...
RobPratt's user avatar
  • 13.9k

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