Fun games

I found a lot of fun and interesting cryptology-related games on the internet and I thought I'd share them with you all.

The first site is http://www.mindfun.com/crypto/.  Just click 'Load Puzzle' and you will be given a simple monoalphabetic substitution cipher to solve.  Some of them are quite easy if you use frequency analysis.

http://enchantedmind.com/puzzles/crypto/cryptography.html.  This is very similar to the first site but instead, this has a timer.  You also have the option to receive hints.

http://www.nsa.gov/kids/home.shtml.  This is a kid-oriented website created by the NSA. It features many games and puzzles in an interactive game zone.

http://www.amazon.com/Brain-Boosting-Cryptology-Puzzles-Sarah-Wells/dp/1902813545. This is only a link to a book.  This book is a collection of "Brain Boosting Cryptology Puzzles," much like the title suggests.

If you have any free time you should check these out.  Some of them are really fun!