The game took 14 months to complete. The design and writing process, conducted solely by Roberta Williams, was six months.
The original Apple II documentation contains a disclaimer stating that there might be mistakes in the game. According to an interview with Roberta Williams with Computer Gaming World (May/June 1982), the reason is that Williams accidentally placed a rhea bird in Australia instead of South America where it belongs to. She was visiting the L.A. zoo where the rheas where placed within the Australian area and so she adopted it into the game. When they discovered the mistake it was too late to correct. Add