Mindstretching Puzzles

Give your brain the kind of workout that will make you sharper, smarter, a better problem solver. Introducing the strange new world of cryptarithms, alphametics, simultaneous equations, and layered thinking--puzzles that will challenge you to replace letters with digits to find words, flatten cubes into two dimensions, find missing persons, break codes, and much more. It's not how much math or algebra you know, but how flexible your thinking is. 96 pages, 60 b/w illus., 5 3/8 x 8 1/4.