Show HN: Sufuku – Sudoku, but Numbers Repeathttps://crossnum.com/sufuku
Sudoku is short for "the digits must be single". I wondered if inverting this would work: "the digits must be repeated". And so, by swapping "doku" for "fuku", Sufuku was born. In short, instead of using numbers 1-9 for a 9x9 board, you use 2 twice, 3 three times, and 4 four times (for a total of 9). It plays differently from sudoku than I expected. I assumed it would be simpler, since you have fewer digits. But once I settled on irregular region shapes, I discovered that it can also be quite difficult. In sudoku you eliminate a number by placing it; in sufuku a number is only eliminated once…
