It is well-known that the minimum number of clues that completely specify a 9 x 9 Sudoku is 17. What is the minimum number of clues required for a 16 x 16 Sudoku whose cells contain one of the integers 1 to 9, or the letters a to g?
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5Duplicate of https://puzzling.stackexchange.com/questions/89036/minimum-amount-of-clues-for-a-16x16-sudoku. In the linked answer, 55 is the smallest found. – DenverCoder1 Apr 28 '20 at 13:15
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1@eyl327 Indeed, 55 is so far minimum (https://www.amazon.co.jp/dp/4873102235). Not verified to be least possible though. Worth revisiting and either proving or improving. – Bernardo Recamán Santos Apr 28 '20 at 13:40