how to install games in ubuntu those which get install in windows(high graphics game)

You might not be able to run these programs (or some of them). If you can, the way to do it is with Wine (http://www.winehq.org). In Ubuntu, Wine is provided by the package "wine", which you can install in Applications > Ubuntu Software Center.

The Wine website has information about what programs are known to work, how well they are known to work (including specifically what works and what doesn't) and, sometimes, guides to getting them to work. However, even if the website indicates that people have been able to get the program to run with Wine, it's possible that it won't work on your computer. Furthermore, since these programs are developed to run in Windows, it is possible that they won't work as intended (including in ways that no one has yet discovered), or that they will work and then one day, due to an update or some other cause, will stop working.

In the best case scenario, once you install Wine, you might just be able to install and use a Windows program exactly as you do on Windows--by downloading its installer, running it, and then selecting the program from a menu and running it.

Counter-Strike Source:
http://appdb.winehq.org/objectManager.php?sClass=version&iId=3731

Final Fantasy XI:
http://appdb.winehq.org/objectManager.php?sClass=application&iId=1992

Race Driver: GRID:
http://appdb.winehq.org/objectManager.php?sClass=application&iId=7375

Search here, if you want information on Wine's ability to run other Windows programs:
http://appdb.winehq.org/objectManager.php?sClass=application&sTitle=Browse%20Applications&sOrderBy=appName&bAscending=true