Puzzle Laboratory

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Polyform Puzzles
Puzzle Laboratory Guide to Hexomino Puzzles

A Guide to Twisting Puzzles

Solving and Composing Cryptarithms
Excerpts from an upcoming guide:

Finding Cryptarithms via Computer Search
The First Cryptarithm Ever Published?
Triple-Key Multiplication and Other Cryptarithms
Using Internal Multiplication Clues

Cryptophile Cryptofile

Logic Puzzles
Dissected Dominoes -- Solving Domino Logic Puzzles
Grid Logic Puzzles

Other Puzzles (e-books available soon)
Number Logic Puzzles (Sudoku, Trailblazer, and others)

A Stupid Calculator Trick

This page was revised on July 6, 2020.   All contents copyright 2008-2020 by Michael Keller.  All rights reserved.