This is the latest game in the pokemon gameboy craze joining pokemon blue, red, green, yellow and the newly released gold and silver. Crystal is from what I have heard similar to yellow in which it is the same game as blue and red but with some added extras. In this case it is the same as Gold and Silver the new extras consist of pokemon now able to learn as many moves as possible, and for any people who think pokemon is sexist there are now two characters to control a boy and a girl. Using the new gameboy mobile phone technology you can now trade over the internet Also pokemon are more animated when they battle e.g.  Charmanders flame moves as it battles.