Define classic, other than "I played it when I was a kid"
Never going to get a definition that satisifes everyone. Best metric I know of right now is VAPS/KLOV. Even that data is only as good as people who put into it, which I suspect is older folks so is weighted heavier towards games we're calling classics that you don't agree with. Still, barring better metrics, here's Moon Patrol for instance:
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There are 7,416 members of the Video Arcade Preservation Society / Vintage Arcade Preservation Society, 4,504 whom participate in our arcade census project of games owned, wanted, or for sale. Census data currently includes 73,089 machines (4,178 unique titles).
Very Common - There are 223 known instances of this machine owned by Moon Patrol collectors who are members. Of these, 142 of them are original dedicated machines, 5 of them are conversions in which game circuit boards (and possibly cabinet graphics) have been placed in (and on) another game cabinet, and 76 of them are only circuit boards which a collector could put into a generic case if desired.
For Sale - There are 11 VAPS members with Moon Patrol machines for sale. There are 11 VAPS members with extra Moon Patrol circuit boards for sale. VAPS members are totally independent of VAPS and the International Arcade Museum, and we are unable to recommend, endorse, or guarantee any person or company selling games or game parts.
Wanted - Very Popular - There are 25 VAPS members currently looking for Moon Patrol.
This game ranks a 84 on a scale out of 100 (100 = most often seen, 1=least common) in popularity based on census ownership records.
This game ranks a 54 on a scale out of 100 (100 = most often wanted, 1=least common) in popularity based on census want list records.
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Centipede
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Very Common - There are 621 known instances of this machine owned by Centipede collectors who are members. Of these, 560 of them are original dedicated machines, 7 of them are conversions in which game circuit boards (and possibly cabinet graphics) have been placed in (and on) another game cabinet, and 54 of them are only circuit boards which a collector could put into a generic case if desired.
For Sale - There are 34 VAPS members with Centipede machines for sale. There are 34 VAPS members with extra Centipede circuit boards for sale. VAPS members are totally independent of VAPS and the International Arcade Museum, and we are unable to recommend, endorse, or guarantee any person or company selling games or game parts.
Wanted - Very Popular - There are 36 VAPS members currently looking for Centipede. There is one VAPS member looking for a Centipede circuit board set.
This game ranks a 99 on a scale out of 100 (100 = most often seen, 1=least common) in popularity based on census ownership records.
This game ranks a 70 on a scale out of 100 (100 = most often wanted, 1=least common) in popularity based on census want list records.
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Edit - added some emphasis