N900 iPhone? You know that the two are totally different, right? One made by apple, one made by nokia?

I'm not sure how much of your confusion is down to language, and how much is down to understanding of what the n900 actually is.

Anyway, the N900 does indeed have the capability (power wise) to run anything which comes out for the iphone (look at 'Bounce' for an example of what can be achieved) but developing a game is something which takes a lot of time and resources...