Quoted from Black_Knight:Run the extension cord if you want. But I was running 28 machines on 2 20 amp circuits and had no power issues on a mix of old and new games. Mine were all occupied at the same time sounds like yours won’t be.
Exactly, I have had 14 machines a single 20 amp breaker for years and never had a problem. Not once. The extension cord is more of a hazard.