Best real time strategy game you will ever see. Recommended to all over 13.

User Rating: 9.5 | Age of Empires II: The Age of Kings PC
-- PROS --
Takes a lonnggg time to beat the whole game in campaigns. You can't finish it in under 50 hours, no chance, whatsover.
Low requirements, runs smoothly even on older computers
Cheap haha.
Well balenced civilizations.
Online play.
Create-a-game features (map editor) That is easy to use, and the same one used to make the campaigns! It's built in!
"Standard games" with different objectvies and etc that you can customize.
Historically accurate.
AWESUME MUSIC!!!!!
Good patches.

-- CONS --
Too many similaries between civilizations.
Can't get on top of walls.
Graphics are a bit outdated.
AI can be STUPID sometimes.
There's an at least 2 hour learning curve. There's a training campaign though =)
75 unit cap, including non military units. In some games, its at 200 though, still annoying low.

But don't trust me, heres the trial for it.
http://www.microsoft.com/games/age2/downloads.htm
Happy playing!