Welcome to The Penguin Sudoku Challenge: with 1 sudoku puzzle for every day of the year 2 challenge you in every way on 3 different levels - beginner, moderate and fist-clenchingly tricky. Perfect 4 sharpening your brain and honing your logic, sudoku will give you a 5 star brain (if they don't hit you for 6). In 7th heaven when you complete them, you'll 8 giving up on any of these - but those 9 by nines won't complete themselves... Good luck!
"Excelente compilado de sudoku en orden ascendente de dificultad (al menos uno por cada día del año), separados en ciclos de una a cinco estrellas (donde una estrella es el más "fácil"). Contiene además otros tipos de puzzle como battery y wayfinder. "