Threshold Research

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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)

MAX Machine

  • "QIX-type game" (unreleased) [1] [2]


  • Explanations of high score initials in Colony 7 and The Electric Yo-Yo [3] [4]