Has anyone tried playing N-Gage games on the Sendo X?. In theory it has the hardware and software capability.

In theory it might, but in practice it would not be legal (you can't use original N-Gage game card MMCs & cracked copies would be illegal). Illegal activities are not a permissible topic of discussion on this site.

i am not sure if sendoX can run n-gage games with 4 something around 5 mb of ram (good n-gage games).