Residual indexes
(Published on 20. February 2025, 06:24 by ark29)
Normal Sudoku rules apply [place the digits 1-9 in every row, column, and 3x3 box]
159 rules apply [Each cell in column 1 indicates the location of the 1 in its row. Similarly entries in column 5 index the locations of 5s, and likewise for column 9 and the 9s.]
Modulo lines [Every set of three sequential digits along a line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}.]
Killer cage [Digits in cages must sum to the total given]
You can play here
The puzzle is also solvable without the killer cage but is considerably more difficult and probably not doable without some bifurcation. If you still want to try it, it is playable here
159 rules apply [Each cell in column 1 indicates the location of the 1 in its row. Similarly entries in column 5 index the locations of 5s, and likewise for column 9 and the 9s.]
Modulo lines [Every set of three sequential digits along a line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}.]
Killer cage [Digits in cages must sum to the total given]
You can play here
The puzzle is also solvable without the killer cage but is considerably more difficult and probably not doable without some bifurcation. If you still want to try it, it is playable here
Solution code: Row 7
Solved by jalebc, tgstar, bugsduggan, sandmoppe, kublai, SKORP17, Postnormal, Willkimo, Fisherman, Wyrdsister, jadezki, belnovic, geronimo92, palpot, Carinthir
Comments
on 21. February 2025, 06:32 by Fisherman
Brilliant.
