Pioneering the computer game industry in the late 1970s, Ken and Roberta Williams founded On-Line Systems and created the first graphics/text adventure game entitled Mystery House. This product set a new standard by which all other games would be judged. Building on their success, On-Line Systems, moved its headquarters from Los Angeles to the Sierra foothill community of Oakhurst, California where the company was appropriately renamed Sierra On-Line. Soon after they developped Roberta's second computer game, The Wizard and the Princess which sold more than sixty thousands copies; a substantial success for the period. Like its predecessor it once again set the standard for what computer gaming was becoming.

But it wasn't until 1983 that Roberta began work on the project for which fans around the world would come to know her best for, the original King's Quest. Groundbreaking for its time, this game redefined the concept of adventure gaming. For the first time players not only controled a character on a 2d platform but had full control over its movements and allowed it to walk in front, behind and around objects on screen. Opening up to a limited audience on the ill faithed IBM Pcjr, this game would grow the following year to become one of the most popular games of all time. Building on the success of the original and continually pioneering new avenues of adventure, the King's Quest series would come to encompass 7 sequels and 3 novels.

Since King's Quest Roberta has gone on to design many more exciting games for every member of the family, including The Dark Crystal (1984), The Black Cauldron (1984), Mickey's Space Adventure (1984), Mixed-Up Mother Goose (1988), The Colonel's Bequest (1989), The Dagger of Amon Ra (1991) and the well known horror adventure Phantasmagoria (1995). The Roberta William's Anthology was released in 1996 and included all but three of her classic games.

Considered by many to be one of the most important designers in the computer gaming industry, there is no doubt that Roberta Williams' legacy will last with adventure gamers for years to come.