What are the rarest/most expensive games for any system?
(back to top) -There are several prototypes of which only one is known to exist. As far as actual production numbers go, the Nintendo World Championship 1990 gold cart would have to be the rarest. Only 26 were produced by Nintendo to be distributed via a contest held in Nintendo Power magazine. This cart also is typically regarded as one of the most expensive cart amongst collectors, with at least one copy reputed to have traded hands for around $6500. As far as games that were actually SOLD, the Europeon version Ultimate 11 (Super Sidekicks 4) for the Neo Geo is said to have had only around 100 carts produced. The European test cartridge of Kizuna Encounter (NeoGeo) is reputed to have sold for 9,000 Euros (around $11,000 USD at the time of this writing) the last time one popped up for sale. It was never released officially and only three copies are said to exist.