This one was hard because so many different games can fit into this category. There are some RTSs and FPSs out there that you could argue belong here. The reason I chose Elder Scrolls III: Morrowindfrom Bethseda Softworks is not only because the game is incredibly gorgeous but because the sheer size of the environments is unlike no other game I have played. Perfect example - usually in a game when you come to a lake you look for a way across to continue your exploration. Not so in Morrowind, you should be exploring beneath the water and more. It seems every nook and cranny is packed with stuff. Top that with the editor the developers used to make the game and you can make your own Morrowind adventure to share with your friends.​