CIRCLE PUZZLER'S MANUAL,  Mainly an attempt to classify different kinds of circle puzzles.   Also contains a solution to Engel's Enigma puzzle.   $15.00

Planet of Numbers   Explore the planet of numbers with 5 as your guide

Mathematical Coloring Diversions  Unique patterns made with an algorithm for multiplying patterns.  You can print out the ones you want and color them.  See ECCurves page.