by Banana·Published 07/17/2026, 01:13:38 AM
Sudoku
Each row, column, and region must contain the digits 1-9 once each.
Nabner Lines
No two digits along a Nabner Line may be repeats or consecutive, regardless of their positions along the line.
Zipper Lines
Pairs of cells equidistant from the center of a Zipper Line must have the same sum. If odd length, the center cell equals that sum.
Entropy Lines
Every set of 3 consecutive cells along an Entropy Line must contain a low digit (1,2,3), a medium digit (4,5,6), and a high digit (7,8,9).
Ratio Kropki Dots
Cells separated by a Ratio Kropki dot must have a ratio of 1 to 2.
Quadruples
The digits in a circle must appear at least once in the four surrounding cells.
Row Indexers
A marked cell in row X indicates the row where X appears in the column.
Box Indexers
A marked cell at position X in a box indicates where X appears in that box.
Column Indexers
A marked cell in column X indicates the column where X appears in the row.
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JONNA good job! I enjoyed this PUZZLE.