As we've seen, limited-edition, low-production and highly region-specific titles – basically the rarities of the gaming world – tend to offer the best returns.

Games specialist Roy Raftery points to Super Mario 3D All-Stars for the Nintendo Switch as a potential future money earner. While it was undoubtedly a blockbuster bestseller, the 2020 title was on a timed release, so copies are relatively limited and have shot up in value over the past five years.

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