I pulled up a map of Ludus on my display. It appeared as a three-dimensional globe floating in front of me, and I gave it a spin with my hand. Ludus was a relatively small planet by OASIS standards, about a third the size of Earth’s moon, with a circumference of exactly one thousand kilometers. A single contiguous continent covered the surface. There were no oceans, just a few dozen large lakes placed here and there. Since OASIS planets weren’t real, they didn’t have to obey the laws of nature. On Ludus, it was perpetually daytime, regardless of where you stood on the surface, and the sky was always a perfect cloudless blue. The stationary sun that hung overheard was nothing but a virtual light source, programmed into the imaginary sky.