YewNes is a NES emulator for S60. In other words, it lets you play Nintedo 8-bits games on a Nokia S60 mobile - including the N-Gage. You can play any NES game on you mobile, and play anytime and anywhere.

Features

Emulates most Nintedo 8-bits games, more than 1,000 games.
Install rom files directly from inbox and Memory card.
5 speed levels, from very fast to very slow.
tow zoom modes, scaled mode and original size mode.
Provides fake TV mode(scanline).
Automatic shot, provide AA and BB Keys, you can release your
fingers.
Snap game screen, you can send your high scroll game screen to
friends.
key control styles match 3650, 7650/3660/6600 and N-Gage.
Free to try, every can download any trail YewNes, and unregister
version provides full features, only limited time.

You can get it for 23$ from http://www.yewsoft.com/yewnes/

Thanks to worreour for the tip