Nintendo Power Magazine held another Nintendo World Championship competition in America back in 1990. The prizewinners, who numbered just 26, each received a shiny gold cartridge. The holy grail of NES games, these ultra-scarce cartridges command crazy prices – a copy sold for just shy of $100,000 on eBay in 2014, which would be worth around $135,000 (£104k) today. Last year, another went up for auction, eventually fetching $170,000 (£131k).