Download or read book Tri-Doku written by Japheth J. Light and published by Sterling Publishing Company, Inc.. This book was released on 2008-04 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers sudoku in a new shape. Instead of squares, this work offers these puzzles in triangles, all colour-coded to indicate special spaces where numbers can't repeat and where new rules of play come into action.