Here are a list of some free PC games:
Almost all games posted will have multiplayer
Alien Swarm-Steam
Altitude-Steam
Half Life 2-Steam/ look this one up off google for the free team death match version (MAKE SURE TO CHECK YOUR GRAPHICS CARD BEFORE DOWNLOADING)
Nexon games (ie. Combat Arms)-www.nexon.net
Counter Strike Decayed Lite-google it
Perfect World-google it
Paid games worth the money
Portal 2-Steam
Starcraft- you can also obtain an illegal download of this
Starcraft 2-Store only or order online
Rome-Steam
Napolean-Steam
Unreal Engine 3-Steam
FAQ:
Q: What is Steam?
A: Steam is a provider for almost all PC games. Some of the games like Starcraft are only bought through store purchase though. It allows you to download it right onto your computer after purchasing them.
Q: Do these games contain viruses?
A: Some contain viruses, but they are viruses to prevent hackers. None of these games will ruin your computer. For the most part all Steam games contain no viruses.
I will be updating this thread, if you have any suggestions for PC games post below and I'll add it to the list.
~Chris