Making play spaces is the whole reason I chose to pursue game design. My map editing days began with forge in Halo. I loved 'Assault' in the early Halo games, so I was bummed that later iterations of the series did not include it. So I made some. Halo 5's forge really opened up the possibilities for me to make darn near anything I wanted. Though elementary compared to Unity, the fun I had in forge was a monumental factor in my decision to pursue game design.