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- Normal Sudoku Rules: Fill each row, column, and 3x3 box with the digits 1-9 once each. - White Kropkis/Black Kropkis: Digits in cells separated by a white dot are consecutive. Digits in cells separated by a black dot have a 1:2 ratio. - Dudeney Cages: Digits in cages must be unique Dudeney numbers with the digits in reading order (left to right, top to bottom) within the cage. Dudeney numbers are numbers whose digit sum cubed, equals themselves. eg. 512 = 5 + 1 + 2 = 8 and 8^3 = 512, so it is a Dudeney number. Digits may repeat in cages if allowed by other rules.
The Perplexities of Henry Dudeney
By lgastako
- Normal Sudoku Rules: Fill each row, column, and 3x3 box with the digits 1-9 once each. - White Kropkis/Black Kropkis: Digits in cells separated by a white dot are consecutive. Digits in cells separated by a black dot have a 1:2 ratio. - Dudeney Cages: Digits in cages must be unique Dudeney numbers with the digits in reading order (left to right, top to bottom) within the cage. Dudeney numbers are numbers whose digit sum cubed, equals themselves. eg. 512 = 5 + 1 + 2 = 8 and 8^3 = 512, so it is a Dudeney number. Digits may repeat in cages if allowed by other rules.