I wonder why Tennis For Two isn't on that list. It came out 3 years before SpaceWar!
It's fun to go through that list and realize you know all those games, and in most of the cases know why it's on that list.

Well, the top 25 at least, above that it gets tricky.
Interesting to see E.T. the Extra-Terrestrial (1982) in the list. One of the games that caused the game bubble to pop around that time. This game must have taught the industry a lesson.
I didn't really understand what Warcraft III's doing there, but apparently it's because of its map editor and the MOBA genre it spawned.
