Calcu-doku & Sudoku Paperback – May 5 2009
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About the Author
CONCEPTIS LTD. is the leading number-logic and picture-logic puzzle supplier to magazine, newspaper, book, mobile, game console and board game providers all over the world. Every day, over 10 million pages with Conceptis puzzles are printed in 40 countries worldwide. Conceptis cooperates with distributors in Korea, Russia, Poland, Brazil, and China and has recently announced its first subsidiary: Conceptis Japan Co. Ltd.