Status:

E-book nr 1: A mixed collection of puzzles with numbers. Some types have been published on this blog, others are unique brainteasers. Download this free e-book now!

E-book n2 2: Puzzles in Properties and Patterns is available at smashwords.com, barnes and noble and in your ibooks.

E-books about puzzles with numbers, about puzzles in the plane, and about puzzles with Logic are in preparation.