Fiendishly Difficult Visual Perception Puzzles Paperback Ivan Mos

Two fiendishly difficult puzzle books; one math, one visual perception

Fiendishly Difficult Visual Perception Puzzles

Fiendishly Difficult Visual Perception Puzzles - Ivan Moscovich (1991, Paperback

Merry Murdle Book 25 Fiendishly Festive Puzzles FREE SHIPPING

Merry Murdle: 25 Fiendishly Festive Logic Puzzles

Logic Grid Puzzles, Volume 1: From Easy to Fiendishly Hard (Logic Puzzles fo...