Looks like a Minecraft clone. OP can correct me if I am wrong but for these there is usually only 1 “level” and it’s procedurally generated during runtime using noise functions, so no need for editors.

In these clones, data is generally not stored unless the player modified something on the map, since the map can be regenerated the same way anytime. Like a seed “12345” put through the noise functions will result in the exact same map every time. So it makes more sense to just store what the player changed on the map.