A feature which allows players to save their sandbox creations, as well as load, import and export their maps. This would allow people to have ongoing builds, test maps, parkour/adventure maps. This feature could entail only a save/load button, and all importing and exporting could be done through placing map files into the corresponding folder in the KAG files., or there could be a fully fledged import, export, download and upload thing, where you wouldn't need to open up a file viewer. This would allow people to share cool map/build ideas, create parkour or adventure maps for single player experiences. I think this would be a great feature that could be added, and is definitely an avenue which I think the devs should look into.