Explorer, RHK Decoding the Universe: A Scientific Cryptogram Puzzle Book Part Two: Crack 600 Real Scientific Principles from Physics to Genetics—Each Hidden in a ... Puzzle Inspired by History’s Greatest Minds

Explorer, RHK Science in Cipher: A Physics Cryptogram Challenge: Unlock 600 Brilliant Physics Formulas—Hidden in Cryptograms for Curious Minds

Explorer, RHK Love Unlocked: Cryptograms of Passion, Pain & Promise: 600 Large-Print Cipher Puzzles Featuring Public Domain Love Quotes — Specially Designed for Clarity, Comfort, and Joyful Decoding

Explorer, RHK The Human Code: 600 Cryptograms from the Frontiers of Biology: Unlock the Secrets of Life, One Puzzle at a Time — Featuring Authentic Human Biology Quotes from Harvey, Cajal, Franklin, Pasteur & More

Explorer, RHK The Divine Code: A Christian Cryptogram Puzzle Book of Wisdom, Peace & Truth PART TWO: Unravel timeless truths from Genesis to Revelation—one encoded ... mental exercise, and faith-filled fun.

Explorer, RHK The Divine Code: A Christian Cryptogram Puzzle Book of Wisdom, Peace & Truth PART ONE: Unravel timeless truths from Genesis to Revelation—one encoded ... mental exercise, and faith-filled fun.

Wordsmith Publishing 600 Cryptogram Puzzles Large Print: Classic Crypto Quotes and Cryptoquips from Timeless Books Puzzle Book for Adults and Smart Kids. Includes Hints ... (Classic Literature Cryptograms Puzzle Books)