Can a mac or Linux play the same games as a PC?

Unfortunately Ubuntu or Linux in general is still not up to general gaming. However things are steadily improving with windows layer compatible and emulating softwares Here are some examples WINE https://help.ubuntu.com/community/Wine Using WINE on Ubuntu http://www.psychocats.net/ubuntu/wine Gaming on Ubuntu with WINE http://www.ubuntu-unleashed.com/2008/05/platinum-top-10-wine-game-list.html Ubuntu World Of Warcraft https://help.ubuntu.com/community/WorldofWarcraft Gaming on Ubuntu while running Cedega https://help.ubuntu.com/community/Cedega I thoroughly recommend Ubuntu 9.04 Technical overview https://wiki.ubuntu.com/JauntyJackalope/TechnicalOverview Performance is exceptional The most outstanding feature for me is having the ability to convert the conventional ext3 filesystem to ex4 which further enhances performance http://ubuntuforums.org/showthread.php?t=1118295 Ubuntu 9.04 Download http://releases.ubuntu.com/releases/9.04/ The Perfect Desktop - Ubuntu 9.04 (Jaunty Jackalope) http://www.howtoforge.com/the-perfect-desktop-ubuntu-9.04 LUg.

I do not speak for Apple, however Linux can emulate a few of these games via third party software (Wine, Cedega, etc). To check what games would be compatible with Wine, please visit: http://appdb.winehq.org/ (as you can see, CS:Source is in the platinum list). Also, Wine is free, so have fun!

Watch these video clips on Games for Linux it will give you an insite to gaming with Linux plus there are 3D shoot em up action games for Linux as well as racing games There are free Linux online 3D games,you could look into

yes but it is much more difficult just stay with Pc if you can?

That really depends. Not all games have a Mac or Linux OS version. If there is one, most likely you have to BUY the mac or Linux version of the game. In cases where there is no mac or Linux version I would suggest using Wine. It will help you be able to run windows games in a mac or linux OS. But it does not work for all games. Here is a list of tested programs (includes games) for wine. http://appdb.winehq.org/ If any configurations are needed to wine to get it to run the game, it will be on the site.