Cyptograma has to be the most appealing interface to a cryptographic puzzle that I have ever seen. Created by Alicia Ramirez of Manitoba, Canada, the game features quotes and phrases to decrypt from famous people, and they are available either in English or en Español.
Each puzzle is in the form of a simple substitution cipher in which each letter of a phrase is substituted with a symbol. It is up to you to figure out the letter that each symbol corresponds to.
To play, use the keyboard and the mouse in combination by first clicking on a symbol to select it, and then typing a letter on the keyboard. All like symbols will then become the letter you typed, regardless of whether you guessed correctly, so keep working with the puzzle until you get it right.
Analysis: The fluorescent lime green and yellow colors together contrasted against the black background creates a visually stunning appearance to the game that really grabs you and pulls you into the puzzle. The use of symbols instead of other letters broadens the appeal of this game to include even those that may not usually play with cryptograms. Overall an excellent game design by Alicia Ramirez. The only area in which I see room for improvement would be a greater number and a wider variety of phrases. Additional languages would also be a nice to have.