I found this list of the top 20 rarest and most sought after games for console games and I'd figure I would share it.

http://www.racketboy.com/retro/2006/09/holy-grails-of-console-game-collecting.html

20 - Panzer Dragoon Saga (Sega Saturn; NTSC-U, PAL)
       Copies Produced: 10,000
       Estimated Price (Complete): $175

19 - Psychic Killer Taromaru (Sega Saturn; NTSC-J)
       Copies Produced: 7,500
       Estimated Price (complete): $235

18 - Sonic the Hedgehog (Sega Master System; NTSC-U)
       Estimated Price (Complete): Up to $200

17 - Congo Bongo (Intellivision; NTSC-U)
       Estimated Price (Loose or Complete): $300

16 - StarFox: Super Weekend/Donkey Kong Country Competition Cartidge (SNES; NTSC-U, PAL)
       Copies Produced: SSW - around 2000; DKCCC - 2,500
       Estimated Price (Loose): $200+

15 - Magical Chase (TurboGrafx 16; NTSC-U)
       Estimated Price (Complete): $225

14 - Myriad 6 in 1 (NES; NTSC-U)
       Copies Produced: at least 888
       Estimated Price (Loose): $350

13 - Bounty Bob Strikes Back! (Atari 5200; NTSC-U)
       Estimated Price (Complete): $500

12 - Mine Storm/Mine Storm II (Vectrex; NTSC-U)
       Estimated Price (Loose or Complete): $500

11 - Bubble Bath Babes (NES; NTSC-U)
       Estimated Price (Complete): $500+

10 - Metal Slug (Neo Geo; NTSC-U)
       Estimated Price: $1000 (Complete)

9 - Atlantis II (Atari 2600; NTSC-U)
     Estimated Price: $1000+ (Complete)

8 - Virtual Bowling/SD Gundam Dimension War (Virtual Boy; NTSC-J)
     Estimated Price: $1000+ (Each, Complete)

7 - Air Raid (Atari 2600; NTSC-U)
     Estimated Price: $3500 (Loose)

6 - Stadium Events (NES: NTSC-U)
     Copies Produced: 2000
     Estimated Price: $1000+ (complete)

5 - Bangai-O: Prize Edition (Sega Dreamcast: NTCS-J)
     Copies Produced: 5
     Estimated Price: Undetermined

4 - Pepsi Invaders (Atari 2600; NTSC-U)
     Copies Produced: 125
     Estimated Price: $1200+ (Complete)

3 - 1990 Nintendo World Championships: Tournament Cartridge (NES;NTSC-U)
     Copies Produced: 90
     Estimated Price: Around $4000

2 - Kizuna Encounter (Neo Geo; PAL)
     Copies Produced: Less than 12
     Estimated Price: $10,000+ (Complete)

1 - 1990 Nintendo World Championships: Gold Edition (NES; NTSC-U)
     Copies Produced: 26
     Estimated Price: $10,000+

Sonic the hedgehog? Really?
I'm gonna be $200 richer soon then :D

that the Master System version, they have more info on it at their site.

I wish I still had my copy of Sonic the Hedgehog.

There are probably only 10 of those games I have ever heard of.

I own Sonic the Hedgehog for the Master System...just the cartridge though, and it's in fair shape.

I remember owning Atlantis for the 2600 in kindergarten...if the second is so rare I doubt I owned that one hehe.

I have Panzer Dragoon Saga Pal complete and in best condition

for Sonic

'You would think that the headlining franchise from the console’s manufacturer would be extremely commonplace. After all, its not hard to find a cheap copy of Sonic for the Genesis or Super Mario Bros on the NES or SNES.

However, the US Sega Master System version of Sonic the Hedgehog was a very low quantity late-release, and today commands the highest price of any game on the system. Think paying $200 for an 8-bit downgrade is steep? Consider that the only difference between this version and the common, $2 PAL version, is a UPC sticker pasted on the packaging! Since the Master System was region-free, Sega simply shipped the PAL extras to the US. It even has the multi-language manual!'

Wow ... and people are upset on the 55.99$ pricetag for PS3 games :P

Wow I never realized it was worth anything...I only owned a Genesis, and I got a bunch of Master System games from a friend, because he was buying a Nintendo and figured I could use the games on my Genesis. I couldn't but I kept them anyway hehe.

Wow--I wanna play Pepsi Invaders XD

*looks for ROM*