Sylvie was one of the conversational characters in the Dark Design game running on the RayGun platform. Sylvie and her three compatriots, Friz, Thomas and Jil used a Chat-L based chatbot and were the first conversational characters on the iPhone. RayGun was also the first multi-user virtual world platform on the iPhone. The Dark Design game used conversational characters to pass on key information to help the game player to solve a mystery. The chatbot server was built by Bruce Wilcox. Avatar personas were developed by Sue Wilcox. Avatars were created by Christian Pramuk and animated by David Colleen.