This one or two player upright video game is not just one dedicated game like Pac-Man or Missle Command. Through the use of modules or packs installed in the machine, more games could be added to its itinerary of playable classics. Early video games had full circuit boards within the machine as well as dedicated transformers and controls. Nowadays, emulators have taken over the arcade and home markets, allowing thousands of games in the footprint of one machine. Pinball machines have also been emulated in this formats. These games are finding themselves more and more in the home market for obvious reasons: you can have 100 of your favorite machines to come home to in one solo unit–and you own the keys!