Hard Mind Puzzles: Sign In Puzzles - 100 Large Print Puzzles (Hard Puzzles)

Sign In is played on a square grid. The goal is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row or column. Some digits may be given at the start. If absolute difference between two digits in neighbouring cells equals 1, then they are separated by a sign "+" or "-". If a border between cells contains a sign "+", a digit in a left or upper cell is one lower than a digit in a right or lower cell. If a border between cells contains a sign "-", a digit in a left or upper cell is one bigger than a digit in a right or lower cell. All instances of consecutive digits are shown by these signs. hard brain teasers - hard math riddles - hard brain teasers with answers - hard puzzles - hardest puzzle - worlds hardest puzzle - hard maths puzzles with answers - hard math puzzles - hard brain teasers for adults - hard brain puzzles - hard mind puzzles - hard math riddles for adults with answers - hard math riddles with answers - hard puzzle games - hard math puzzles for adults - hard mathematical puzzles - very hard maths puzzles - hard mathematical riddles with answers - very hard math riddles - hard mathematical riddles

Author: Jeff Heldt

Publisher: Independently published

Publication Date: Aug 10, 2018

Number of Pages: 115 pages

Language: English

Binding: Paperback

ISBN-10: 1718108818

ISBN-13: 9781718108813