Ideal Game?

What's your ideal game, that has everything you could ever want. And no matter how advanced we got it would never get old?

If you want your player to want to play your game for a long time you need only one thing:

The ability to level their character up and get stronger. If you have a good game where players can level up they will want to play the game for a very long time. Just think of World or Warcraft...