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Sierra Entertainment

Company
Primary language: English
a.k.a. On-Line Systems, SierraVenture, Sierra On-Line
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Sierra Entertainment, Inc. (formerly On-Line Systems and Sierra On-Line, Inc.) was an American video game developer and publisher. Founded in 1979 as On-Line Systems, by Ken and Roberta Williams.

Releases

Mystery House
1980-05-05Mystery HousePub & Dev
Mission Asteroid
1980Mission AsteroidPub & Dev
1983AllMission AsteroidPub & Dev
Wizard and the Princess
1980Wizard and the PrincessPub & Dev
Cranston Manor
1981Cranston ManorPub & Dev
1983Cranston ManorDev
1983Cranston ManorDev
Time Zone
1982Time ZonePub & Dev
Las Vegas
1987-0118+Las VegasDev