I wrote an article about how to turn wordpress into a game site a month ago. To save you time, i have assemble all the neccessary files together for you to download. I hope that will save you time, and you can start your game site right away.

Using the Km603 theme, you can turn your Wordpress into a game site.

Demo: http://www.km603.com

Features:

+ All Wordpress functionalities.
+ Game Played counter.
+ Ad space ready.
+ Lastest Played list.

Instructions:

+ Install Wordpress first.
+ Upload Km603 theme and plugins.
+ Activate plugins and the theme.
+ Set up the More-Fields plug in. (like this http://www.u5i.net/wp-content/uploads/2008/07/gamesite01.jpg)
+ Add new games. (like this http://www.u5i.net/wp-content/uploads/2008/07/gamesite03.jpg)

Mre details about setting up and adding games, pleasse read: http://www.u5i.net/turn-wordpress-into-a-flash-game-site-21

More:
You can add any other Wordpress plugin you want.
Recommend the Wp-Rate plugin.

Credits
This theme is the first theme that i made, so it is some what unprofessional. I am not a professional coder wither.
Feel free to modify the template if you want. Free free to distribute it if you want.

Download:
WP Game Site Theme (143)