Its very easy to create and host your own Arcade Games Website with PHPBB.
All you need is
1 – A domain name
2 – Web Hosting Provider
3 – Website Platform
4 – Arcade Module
5 – Games
1 ,2 & 3- I suggest the 99p starting up deal from http://andthenhost.com for PHPBB Forum Hosting. Its so easy to buy your domain and with the 1 click install system your forum is up and running in hours.
3 & 4 – I suggest the following PHPBB Arcade module. You can also download many arcade games free as well from this site!
Link – http://www.phpar.com/
If you setup a site make sure you post a comment on my site for others to see your examples and play your games 🙂
My college setup the following site last month and added this Arcade module for his forum members – http://www.catforumchat.com