Over time, several major types of Netrek were created as people experimented with different extensions to the game. The most popular form is known as Bronco, named for the server at CMU. Particularly noteworthy are Paradise, which is designed to be more like Star Trek: The Next Generation with a more complex game universe, and Netrek Hockey, which is designed to resemble a hybrid of Netrek and ice hockey. Paradise's lack of success has been partly attributed to the lack of a Windows client; while all other variants of Netrek can be played using the same client program, Paradise has added features which require a more complicated client program.