First published in Dell Pencil Puzzles and Word Games, it didn't take its current name until it became a hit in Japan.
Designed by Howard Garns, it first appeared in America in 1979 though didn't catch on until recently. It can be solved by deterministic finite automation on boards of a finite size. First published in Dell Pencil Puzzles and Word Games, it didn't take its current name until it became a hit in Japan. That name is an abbreviation for a phrase which means "the digits must remain single." For 10 points what is this puzzle game in which the digits one through nine must be placed in a 9X9 grid with 3X3 subgrids?
Designed by Howard Garns, it first appeared in America in 1979 though didn't catch on until recently.
{sudoku}