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175 Even More Sudoku Medium Variations: Taking regular suduko variation and variants puzzles to the next level - brain training puzzles- handy, pocket - Paperback -
Sudoku 120 SAMURAI medium puzzles: A challenging Sudoku variation brain training in a handy pocket sized paperback book - Paperback -
Adult Activity Brain Training Puzzle Collection: A relaxing compendium of favorite, brain teaser puzzles for adults, series 1 - Paperback -
200 medium Sudoku puzzles with answers for those long summer days: Brain training puzzles for children to adults - Vol 1 - Paperback