Ben chose to look into covering a Ghostbusters game in following the death of Harold Ramis. It was through investigating that he discovered the link between the various games mentioned in this episode.
Though a follow-up resolving the mystery was not produced, a Twitter conversation with the creator of 'P.P. Hammer and his Pneumatic Drill' reveals that Kemco did not license the game from him, meaning that 'Mickey Mouse IV' and its variants are technically rip-offs.