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If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, withing 24 hours on weekdays.
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Dr. Ecco Is A Mathematical Detective And Puzzle Solver. In This Book Readers Are Invited To Join Him In Solving Nearly 40 Puzzles Inspired By Methods In Computer Science And Mathematics, Including The Tower Of Lego, The Odd Doors Problem, Spies And Double Agents, Gossiping Defenders, Code Breaking, And Many More.
⚠️ WARNING (California Proposition 65):
This product may contain chemicals known to the State of California to cause cancer,
birth defects, or other reproductive harm.
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⚠️ California Proposition 65 Warning: Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
