What game do you have the best memories of playing?
This past weekend I saw one of my favorite games of all time, The Matrix Online, shut down. While it wasn't the best game in terms of game play, it had the best community I've ever played with and it had the coolest events I've ever taken part in. The friends I've made and the memories I have with MxO are things that I'll always remember fondly, and I hope to keep in touch with those friends for years to come.
What are some of the games that, when you look back, you've had the best time with..or the best memories? If you can, please share why you've listed those games.
Here is my list, off the top of my head:
The Matrix Online Age of Empires Command and Conquer: Generals Call of Duty: United Offensive Call of Duty Sonic the Hedgehog GoldenEye 007 WWF Royal Rumble