I've been to their shop in Tokyo. It's amazing. Sadly most of their pencil puzzles are not sold in regular bookshops, only sudoku is popular, but there are so m

I've been to their shop in Tokyo. It's amazing. Sadly most of their pencil puzzles are not sold in regular bookshops, only sudoku is popular, but there are so many more interesting ones - Slitherlink, Nurikabe, Kakuro...