by Banana·Published 07/11/2026, 11:16:19 PM
Sudoku
Each row, column, and region must contain the digits 1-9 once each.
German Whisper Lines
Adjacent cells along a German Whisper Line must differ by at least 5.
Dutch Whisper Lines
Adjacent cells along a Dutch Whisper Line must differ by at least 4.
Sequence Lines
Digits along a Sequence Line must form an arithmetic sequence with a constant difference. E.g., 1-2-3, 2-5-8, or 7-7-7.
Column Indexers
A marked cell in column X indicates the column where X appears in the row.
Skyscrapers
Each digit represents a building height. Clues outside the grid give the number of buildings visible from that direction, where taller buildings block the view of shorter ones behind them.
Between Lines
Digits along a Between Line must be numerically between the two digits on the circles.
Renban Lines
Cells along a Renban Line form a set of consecutive digits in any order, without repeats.
X
Cells separated by an X must sum to 10.
Negative Diagonals
Digits cannot repeat along negative diagonals.
Slow Thermometers
Digits along a Slow Thermometer must increase or stay the same as they move away from the bulb.
Quadruples
The digits in a circle must appear at least once in the four surrounding cells.
Box Indexers
A marked cell at position X in a box indicates where X appears in that box.
Row Indexers
A marked cell in row X indicates the row where X appears in the column.
Even
Marked cells must contain an even digit.
Ratio Kropki Dots
Cells separated by a Ratio Kropki dot must have a ratio of 1 to 2.
Counting Circles
A digit on a circle indicates the number of circles containing that digit.
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