>Another great feature of Age of Empires: Definitive Edition is the fact that you can zoom in and out of the game. Now, how is that possible on 2D assets without exploding into a pixel storm? By adding “Zoom Levels“. Basically, every asset in the game has been rendered 3 times. This way, the game can be displayed crisp and clear in every supported resolution. From HD all the way up to 4K (and beyond)
>This also explains why the game is such an incredibly large download (17GB!) compared to the original (300MB).
https://www.forgottenempires.net/age-of-empires-definitive-edition-is-it-a-3d-or-a-2d-game