The N-gage service works like a charm on the Nokia 5320, another reason to buy the phone. Since N-gage's decline, Nokia decided to take a bold step: make it available on other devices. From what I've read, this is the only music phone WITH a keypad to support not only the S60 platform, but N-gage too.
Visiting N-gage's site will give you details on whether your phone supports the N-gage platform, and where you can download it. Since my phone came with it preloaded with two N-gage games (SIMS 2: Pets and Creatures of the Deep: Hooked On), I managed to get my hands dirty - except there is a caveat - the games were trial only. Some games let you play for a certain number of levels, others didn't.
There are cracked versions of the N-gage games, but not all work with this phone. Some may give an error, others won't. It's a trial-and-error, and the reason cited for this is because the phone is a feature-pack 2 phone, and the games haven't been cracked for this software release as of yet. (In order to play cracked games, you need to go through a process called "hacking" on your Symbian phone, which involves installing a program. A firmware update or a phone reset erases those "hacks").
While I go on hunting for more (trial) games, I guess you can wait for another segment of the Nokia 5320's review.