Regarding 2038 SP

Is everything part of SP as well as MP? I noticed that the Cube isn’t there at the beginning for instance. How about Stonehenge and Abyss items/levels?

This project is only meant for multiplayer. Some aspects might work in single player, but it’s untested and lacks content as you’ve found.

Single player mods can be found in the Revival forums, including Stonehenge and Abyss items.