Standard Sujiko comprises a 3x3 grid containing the digits 1-9 with only three specified. Four 2x2 box totals are given and the grand total is 9x10/2=45. This gives five equations in six unknowns. Unknown digits can be tried in turn at one position until the equations are successfully solved. My program finds determinants by permuting and summing 120 terms of weight 5, the majority zero, and then applies Cramer's rule. It works well for the 3x3 grid.

Super-Sujiko has a 4x4 grid for 1-16 with 5 cells specified, one iterated and nine 2x2 box totals. The resulting 10 equations have not yielded a non-zero determinant and this designation may be insoluble.


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