Games for Linux

I want games tat can be run on linux os . tell some games like mostwanted but for linux os and also the game should be able to run on lan for multiplayer ..

Not sure what you mean by "mostwanted." But here is a list of games that run on Linux, and also have LAN multiplayer capability:

Alien Arena (FPS): http://red.planetarena.org/
Enemy Territory (FPS): http://www.planetwolfenstein.com/enemyterritory/
Nexuiz (FPS): http://www.alientrap.org/games/nexuiz
OpenArena (FPS): http://openarena.ws/smfnews.php
Sauerbraten (FPS): http://sauerbraten.org/
Smokin' Guns (FPS): http://www.smokin-guns.net/
Teeworlds (Shooter): http://www.teeworlds.com/
Tremulous (FPS): http://tremulous.net/
True Combat Elite (FPS): http://www.truecombatelite.com/
Urban Terror (FPS): http://www.urbanterror.info/home/
Battle for Wesnoth (Strategy): http://www.wesnoth.org/
Freeciv (Strategy): http://freeciv.wikia.com/wiki/Main_Page
Freecol (Strategy): http://www.freecol.org/
Scorched3D (Strategy): http://www.scorched3d.co.uk/
SpringRTS (Strategy): http://springrts.com/
UFO Alien Invasion (Strategy): http://ufoai.ninex.info/wiki/index.php/About
WarMUX (Strategy): http://www.wormux.org/phpboost/news/news.php
Warzone 2100 (Strategy): http://wz2100.net/
ArmageTron Advanced (Racing): http://armagetronad.net/
Crossfire (RPG): http://crossfire.real-time.com/index.html
Savage (Strategy/Shooter): http://www.s2games.com/savage/

Phew! That took a while. Hope you have fun!

Source (give credit where it's due): Free LAN Party Games