This week another Nintendo World Championships cartridge went up for auction.
Considered by many to be the holy grail of Nintendo collecting, only 90 copies of the grey NWC cart exist, with each valued at over $10,000.
Although the cart ultimately didn't sell, with the final bid of $99,902
ultimately being retracted, there's still no denying its value.
But it isn't the only rare game out there. In fact, there are some that are even more valuable and much sought-after by collectors. Here are some of the more expensive and more interesting rare games out there. Collect them all!
Actually, don't. That would be ridiculous.
Nintendo World Championships ($18,000) It makes sense to start with the game that's been in the news most recently. Only 90 copies of the Nintendo World Championships cartridge were released, and even fewer remain in mint condition. The gold version is even rarer, with only 26 ever created.
Tetris ($1 million) Thanks to Nintendo's legal intervention, the Sega version of Game Boy phenomenon Tetris never made it to the shops, but that doesn't mean copies don't exist (there are less than 20 in existence). Last year a signed copy of the Mega Drive version - the only one in the world - was allegedly sold for $1 million on eBay.
Pepsi Invaders ($2,125) This Space Invaders clone game was created by Coca-Cola and given to sales executives at a 1983 sales convention. Only 125 copies exist.
Fallout 3 Survival Edition ($700) Despite containing only a single item more than the standard Collector's Edition (a Pip-Boy 3000), the Survival Edition of Fallout 3 was sold exclusively through Amazon and has proved exceedingly rare.
Sonic Adventure: Limited Edition ($300) This special pre-release version of Sonic Adventure was only available to rent from US firm Hollywood Video in July 1999, and was never officially released. A few employees, of course, did get their hands on it...
Half-Life: Blue Shift (unknown) Gearbox Software's second expansion for Half-Life was originally intended to release as part of a Dreamcast Half-Life port, but it was expectedly canned as Sega's hardware ship steered towards the rocks. Some copies supposedly did make it to production however, though a later ROM leak made it increasingly difficult to track down an authentic copy.
Zelda: Majora's Mask Adventure Set ($2000) Only 1000 numbered Adventure Set editions of Zelda: Majora's Mask were ever produced, each containing among other goodies a watch, soundtrack and Certificate of Authenticity.
Donkey Kong Country competition cartridge ($2000) This special version of Donkey Kong Country was playable exclusively at Blockbuster and never received a commercial release. Outside of employee eBay auctions, that is.
Uncharted 2: Among Thieves Fortune Hunter Edition ($4000) Uncharted 2's Fortune Hunter edition - featuring a replica of the Phurba Dagger Artifact - was only available through official Sony competitions and now fetches up to $4,000 on auction sites. Only 200 exist.
Gamma Attack ($20,000 - $50,000) It had been rumoured for years that Atari peripheral manufacturer Gammation had made a game, and one day an Atari collector found it. He initially tried to sell Gamma Attack for an insane $500,000, but nobody bought it. He's still to sell the game but has claimed to have had offers of up to $50,000 for it.
Stadium Events ($22,800) Only 2000 copies of the American version of Stadium Events were produced, making it the rarest commercially available NES game. One of two known sealed copies sold for $22,800 in 2011. The UK version is nowhere near as rare.
Birthday Mania ($15,000 - $35,000) An idea from the aptly named Personal Games, Birthday Mania was a customised made-to-order game which featured a child's name on the cartridge and the title screen. Only a couple are known to have been made.
Bangai-O: Prize Edition ($800) Despite being near-identical to the retail version other than a few logo changes, Bangai-O: Prize Edition is considered one of, if not THE rarest Dreamcast game in existence, thanks to just five copies making their way to high score compo winners.
Air Raid ($31,600) There are only twelve known copies of this Atari 2600 game. It's best known for its oddly shaped cartridge.
Metal Gear Solid 3: Snake Eater Premium Package ($300) This Metal Gear Solid 3 special edition was only released in Japan and contains a statuette, booklets and special DVD.
Propeller Arena (unknown) A Dreamcast game canned right before release (due to the events of 9/11), a small number of retail Propeller Arena copies made it to the wild, though again rampant ISO downloads make tracking down a legit copy quite difficult.
Nintendo Campus Challenge ($20,100) Even rarer than the Nintendo World Championships cart is this beast. A competition cartridge held at 60 campuses across America, every one is thought to have been destroyed after the compo ended. Except for one.
Kizuna Encounter ($12,000 - $13,500) Here's an odd one. The Japanese version of Kizuna Encounter is not rare in the slightest. In fact, it's quite common. The European version is exactly the same cartridge, the only difference being the cover and the manual. And yet because only twelve copies exist, it's worth a ton.
Punch-Out!! Gold Edition ($300) Only 10,000 copies of this pre-release version of Punch-Out - which contains new characters and no Mike Tyson - were given out as part of a Nintendo Japan Golf tournament.
NBA Elite 11 ($1,500) After its glitchy demo was widely mocked for being atrocious, EA quickly scrapped its NBA game just weeks before it was due to go on sale. A single batch of copies left the warehouse though, meaning 15 known copies exist.
Dead Space: Ultra Limited Edition ($1,000+) Released in 2008, only 1000 copies of EA's Ultra Limited Edition of the original Dead Space were released at $149 a pop. They now fetch over $1,000 on auction sites.
Doshin The Giant 2 ($800) The ill-fated Nintendo 64 DD add-on is tricky enough to secure as it is, but Nintendo's sequel to its niche Doshin title is said to have had only 3,000 copies printed: and that's after Nintendo had suspended the 64DD Randnet service in Japan.
Nintendo Powerfest 94 ($12,000) The second Nintendo World Championships was sponsored by Nintendo Power magazine. This time only 33 cartridges were made, but most were returned to Nintendo and reused for parts. Only two cartridges are known to still exist - the first was put up for auction at $300,000 but nobody bought it. The second sold for $12,000.
Resident Evil 6 Premium Edition ($1,300) Capcom released this limited edition version of Resi 6 complete with a replica of the jacket Leon Kennedy wears. Too bad it's the one he wears in arguably the worst series entry.
Grid 2 Mono Edition (£125,000) There aren't many games that come with their own supercar, but this ridiculous special edition of Grid 2 does. Unsurprisingly, only one was made available.
Saints Row IV Super Dangerous Wad Wad Edition ($1 million) Finally, there's this bonkers offering. It comes with (deep breath), a replica dubstep gun, a full day of spy training, a trip to space with Virgin Galactic, one year's membership of E25 Super Car Club, a Lamborghini Gallardo, plastic surgery, a shopping spree with a personal shopper, 7 nights for two at The Jefferson Hotel in Washington, a hostage rescue experience, a Toyota Prius with insurance and a week in the royal suite at the Burj Al Arab with flights for two. Oh, and the game too, obviously.