From Sega Retro
|Founded: 1979 (as On-Line Systems)|
|Merged into: Activision (2008)|
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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)
- Phantasm (1997)