I discovered this puzzle created by Leonhard Euler from Switzerland on the Random Good Stuff blog. The site is in German, but the rules are simple and very similar to sudoku. Each square has an inner and an outer color. Each outer color may be used only once in each row and column, likewise each inner color may only be used once in each row or column. (Though the same color can appear in as both an outer and an inner color in the same row or column.) Additionally, each color permutation (outer and inner) for each square must be unique.
You might also imagine this puzzle as a two-digit sudoku where each digit must be unique in its row or column and the two digits must form a number that’s unique for the whole puzzle.
Interestingly, there are no starting conditions when playing the puzzle on the site. The goal seems to be just to come up with a valid configuration.
Tags: puzzles,sudoku
No comments for Owel’s Puzzle »
No comments yet.
Leave a comment