That's purely because it's a console game! Not a game that was rushed to make a quick buck!
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Umm since it's a port of a console game with no extra graphix, then it was rushed to make a quick buck!
I been there, it's a pretty good tour. That house is crazy man, doors lead to nowhere and stuff. One room is all cracked up and damaged from the 1906 earthquake.
It's called Geoforms. I think it responds to sound or something. People with 7xxx nvidia cards can try it out and see how it runs. I'll DL it when I get home.
http://www.nzone.com/object/nzone_geoforms_downloads.html