Roberta suggested that adding graphical scenes to the otherwise text - based game would make it more interesting for players .
The pair bought a VersaWriter machine , which allowed users to trace over a line drawing and convert it to a digital drawing .
Roberta suggested that adding graphical scenes to the otherwise text - based game would make it more interesting for players , and the pair bought a VersaWriter machine , which allowed users to trace over a line drawing and convert it to a digital drawing .