Collectors say still-sealed test-market game is gaming's Action Comics No. 1.
Before you go searching to see if that old cartridge in your attic might be your gateway to riches, note that this copy of the game is so valuable primarily because it’s one of the earliest known copies of the game, and in near-perfect condition. The box in question comes from Nintendo's extremely limited "test market launch" for the NES in New York City and Los Angeles starting in late 1985 (no one actually knows the exact date). These copies didn't come in the usual shrink wrap but were instead sealed with a small matte or glossy sticker (this handy guide outlines the many different Super Mario Bros. box variants released between 1985 and 1994).