Mathematically, solving a Sudoku Ripeto or Custom Sudoku puzzle, just like any other Latin puzzle, can be seen as a problem of hypergraph coloring. As with classical Sudoku, finding puzzles and solutions can be performed with techniques like constraint programming or dancing links.
interest are questions of existence, enumeration and minimality. For
example: what is the minimum number of clues that a Sudoku Ripeto
puzzle played with numbers 111222333 may have? The answer for classical Sudoku is 17.
Many interesting decision questions about Sudoku Ripeto may well be NP-complete.
In this case there could be no worst-case polynomial time algorithm
able to answer them. One of these questions is: given a partially filled
board, does it have a solution? For partially filled Latin squares the
problem is known to be NP-complete indeed.
Custom Sudoku: Countries & Territories (Volume 1) contains 252 puzzles in assorted difficulties, each featuring the name of a country or...
Sudoku Ripeto is, like classical Sudoku, a Latin Puzzle played on a square board with nine rows, nine columns, and four 3 x 3 sub-squares a...
This is a short description of Sudoku Ripeto and Custom Sudoku, the first Sudoku variants with repeated numbers and letters, respectively. ...