A destroyed planet. There is still atmosphere because the dense core is still intact, providing gravitational pull. Within this bubble of atmosphere are floating asteroid pieces of the planet that can be jumped between. Each asteroid has its own gravity depending on its mass, mixed with the gravitational pull toward the center. So if you jump toward the middle, you can traverse great distances, jumping away from the middle you travel less distance. Asteroids may still have vegetation or buildings on them from when the planet was intact. It might be a good arena for fighters that have wings, jet packs, and other means of flight. (Wings would still work because of the atmosphere, but flying away from the center would be much more tiring than flying toward the center). This is not IRL scientifically viable, it’s based off of “comic book physics” for entertainment value.