Solo

Solo is a part of Simon Tatham's Portable Puzzle Collection, a collection of small computer programs which implement one-player puzzle games. In Solo, you have a square grid, which is divided into as many equally sized sub-blocks as the grid has rows. Each square must be filled in with a digit from 1 to the size of the grid, in such a way that every row contains only one occurrence of each digit every column contains only one occurrence of each digit every block contains only one occurrence of each digit. (optionally, by default off) each of the square's two main diagonals contains only one occurrence of each digit. You are given some of the numbers as clues; your aim is to place the rest of the numbers correctly.

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