Circadence Corporation is a technology company headquartered in Boulder, Colorado. Circadence was founded in 1993 as VR-1. The company originally produced and released online videogames, for clients including AOLs Game Channel and Deutsche Telekom. The company was one of the first to begin developing massively multi-player games, releasing titles including Air Attack and SARAC, and first entering the national market with this slate of games in 1996-97. In 1998 VR-1 received $13.8 million in private placement funding. In 1999 the company partnered with Hasbro Interactive to deliver e-mail adaptations of Scrabble, Battleship and Grandmaster Chess. In 2000 the company changed its name to Circadence and turned its attentions to software that could speed up website performance, though it maintained an entertainment division that kept the name VR-1. Circadence sold off the division to Pacific Century CyberWorks Japan Co in February 2001 for a 5.3% stake in Pacific Century CyberWorks. Circadence also received an investment from a pool of investors to transition the company to alter its focus to WAN Optimization.