Link collections of nikoli.com
Reference site of nikoli.com
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NIKOLI Co.,Ltd.
Nikoli Co., Ltd. is a publishing company also running nikoli.com. Please visit the "Purchase Nikoli Books" page, if you would like to enjoy our puzzles in book form.
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Gamedesign
The flash interfaces for the puzzles on nikoli.com were created by Gamedesign. There are many free Flash games at this site.