Reading: WORLD RIDDLES - very hard - 250 logical puzzle + bonus 250 classic Killer Sudoku: 50 Nurikabe 12 x 12 + 50 KaKuroDoku 12 x 12 + 50 Khitori 12 x 12 + ... Sudoku puzzles - 9 x 9 (PITSTOP Puzzle Bonus) full version

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