From golden Nintendo cartridges to games that let you play as an 8-bit Moses crossing the Red Sea, we've tabulated the rarest and most expensive games of all time.
People are willing to pay a hefty price for nostalgia and one-of-a-kind releases, and thanks to retro gaming website RacketBoy, you now see just how much. Just because video games are fun doesn't mean they can't mean serious business.
Spoiler alert: People love rare Atari games.
15. 'Elemental Gearbolt' Assassin's Case (PS1): $US1,400-$1,750
The Assassin's Case was awarded during a 1998 E3 tournament, and only 40 of these limited-edition bundles were produced. The case includes the 'Elemental Gearbolt' game and a golden 'GunCon' and memory card.
14. 'Eli's Ladder' (Atari 2600): $US1,500-$1,700
Players answer simple maths questions to move Eli up the ladder and into his spaceship, all so he can fly to the moon. The game even includes a wall chart and motivational stickers, according to RacketBoy.
13. 'Karate' (Atari 2600, Ultravision release): $US2,500-$4,000
The Ultravision version, released first in 1982, is far more valuable than the Froggo release, though the games are exactly the same.
12. 'Gauntlet' (Atari 2600): $US3,000-$5,000
Interestingly enough, 'Gauntlet' was a mail-order game that didn't even have traditional packaging. Instead, the game would arrive in a foam case.
11. 'Tetris' (Sega Genesis/Megadrive): $US3,000-$16,000
The unlicensed version was recently confirmed to exist by none other than 'Tetris' creator Alexey Pajitnov (pictured). RacketBoy estimates around 10 copies of 'Tetris' for Sega Genesis exist today.
10. 'King of Fighters 2000' (Neo Geo): $US3,540-$6,000
With only 100 confirmed copies in the wild, 'King of Fighters 2000' is the last in the series produced by publisher SNK before their bankruptcy.
9. 'Ultimate 11/Super Sidekicks 4' (Neo Geo): $US4,800-$10,000
The original 'Super Kicks,' released in 1993, was the first soccer game for the Neo Geo system.
8. 'Atlantis II' (Atari 2600): $US5,000-$18,000
Winners of the 'Defend Atlantis' competition were sent copies of 'Atlantis II.' RacketBoy reports that the four finalists were flown to Bermuda for the ultimate showdown, with the winner receiving $US10,000 in prize money.
7. 'Kizuna Encounter' (Euro): ~ $US5,400-$13,500
You can find this fighting game at arcades, however, and the Japanese release is far more common. The mysterious and tough-to-trace European production run of 'Kizuna Encounter' has led to sales that RacketBoy reports 'supposedly ended in the range of $US12,000-$13,500.'
6. 'Red Sea Crossing' (Atari 2600): $US10,400-$14,000
5. 1991 Nintendo Campus Challenge (NES): $US14,000-$20,100
It was sold for $US14,000 in 2006 and resold for $US20,100.
4. 'Air Raid' (Atari 2600): $US14,000-$33,400
According to RacketBoy, only 12 copies of the game are rumoured to exist. Two copies of 'Air Raid' have sold recently for $US14,000 and $US33,400 on eBay and gaming auction site GameGavel.
3. 1990 Nintendo World Championships: Gold Edition (NES): $US15,000-$21,000
The game itself consists of a customised combination of 'Super Mario Bros,' 'Rad Racer,' and 'Tetris,' all with a special tournament timer ticking away.
2. 'Birthday Mania' (Atari 2600): $US15,000-$35,000
'Birthday Mania' allows players to play mini games consisting of popping balloons and blowing out candles. It also comes in a box that allows you to personalise it with a birthday message or name.
1. 'Gamma Attack' (Atari 2600): $US20,000-$50,000
Only one cartridge was produced by gaming company Gammation, and it currently is owned by collector Anthony DeNardo, according to RacketBoy. DeNardo has listed the cartridge on eBay before, asking a $US500,000 Buy-It-Now price.