serendipity

can someone help me to pick one of follow game?  
can get one for free, but I am don't play games, so don't even know what's good which one are not..

Zoo Tycoon 1.0
Zoo Tycoon: Dino Digs Expansion
Age of Empires II: Age of Kings
Age of Empires II: Conquerors Expansion
Casino 1.0
Asherons Call II
Combat Flight Sim 2
Dungeon Siege 1.0
Flight Sim 2002 Pro
Links 2003
Mech Commander
Mech Warrior 4
Mech Warrior 4: Mercenaries
Racing Madness
Rallisport Challenge
Return of Arcade
Train Sim 1.0