The Sierra Network

The Sierra Network
Predecessors
  • Sierra BBS
FoundedMay 1991 (1991-05)
Defunct1998 (1998)
Headquarters,
United States

The Sierra Network (TSN), later rebranded as the ImagiNation Network (INN), was an online service launched in 1991 by Sierra On-Line. Developed beginning in 1989, the service offered subscribers an online space to play games and socialize, billing itself as a "cyberspace theme park." TSN was the first service focused exclusively on online gaming and was among the early adopters of online avatars.