From Sega Retro
|Founded: 1979 (as On-Line Systems)|
|Merged into: Activision (2008)|
|Headquarters: United States|
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Sierra On-Line (known as Sierra Entertainment since 2002 and formed as On-Line Systems in 1979) was one of the premier adventure games developers in the 80's and 90's. They owned Dynamix.
- Bouncers (1994)
- Police Quest III: The Kindred (unreleased)
- Space Quest IV: Roger Wilco and the Time Rippers (unreleased)
- Leisure Suit Larry in the Land of the Lounge Lizards (unreleased)
- King's Quest V (unreleased)
- Mixed-Up Mother Goose (unreleased)
- Stellar 7 (unreleased)
- 3D Ultra Pinball (unreleased)