Sudoku Variants Puzzle Book : 100 Sudoku Stress Relief Puzzles

Frame Sudoku (also known as "Outside Sum Sudoku") consists of an empty grid. Numbers in the outside frame equal the sum of the first three numbers in the corresponding row or column in the given direction.

• | Author: Fumiko Kawai
• | Publisher: Independently Published
• | Publication Date: May 29, 2018
• | Number of Pages: 115 pages
• | Language: English
• | Binding: Paperback
• | ISBN-10: 1983026204
• | ISBN-13: 9781983026201