Threshold Research Corporation was a company founded by husband-and-wife Randy Pfeiffer and Sandy Pfeiffer. It was incorporated on December 22, 1980, and dissolved on February 9, 1983. Randy was the president.
Research Methods: Online resources, shared staff
- Colony 7 (Taito)
- The Electric Yo-Yo (Taito)
- Qix (Taito)
- Qix II: Tournament (Taito)