If you happen to not be able to find a game you own, play or want in the Pwned Game Database. You are more then welcome to add in that game, http://pwned.com/addgame/
Now this below is why this thread was created.
Seems pretty daunting being required to add in all of that info, just for you to go through the trouble of adding the game you want. Don't worry you can work around this for not filling in the required info. Just as long as the game "Title" is correct. You can place just a few letters in "Developer" and "Publisher" and "Genre" areas, select the correct "Type", Date can also be left as is. And the "Game Cover", anything laying around as a pic can work for this. You are more then welcome to do the footwork to obtain all of the correct info, but the team that is on these, is also going to do that anyways.
So whatever makes it easier for you as a member to add a game, go for it. You like to fill in all the info, thank you. If not, follow the above steps and make it a little easier on yourself. Its ok the staff here won't mind hunting down the right info. Gaming is their passion in life, so anything you do to make them look at more videos games then they do already, I would say go for it. I am sure they will not mind