For the Alphabet Puzzle, you need eight nickels, eight pennies and eight dimes, and a smooth surface to slide them on. The coins, all touching, must be lined up in eight nickel-penny-dime sets: NPDNPDNPDNPDNPDNPDNPDNPD.
Bergerson, Howard W.
"The Alphabet Puzzle,"
Word Ways: Vol. 26
, Article 13.
Available at: http://digitalcommons.butler.edu/wordways/vol26/iss2/13