What's the rarest videogame(s)/console(s) you own

[DaColdFlash]

the rarest videogame i own with cover, disc etc?

Hidden Stroke 2 on PC. Game was released for 15 bucks in 2005. Now amazon lists only 2 used copys at a price point of 60euros (85 us dollar) and above.

For only 6years thats what i call an increase in value.