I've been playing with Minetest instead, because it is easier to work in isolation without a Roblox server. Can you run a Roblox server in single player mode?
Yes, and you can run a local server as part of the test functionality in Studio.
Thanks! I'll give it a try this weekend. I tend to isolate, so social gaming is not my comfort zone, which is why I like to play Minetest on my local machine by myself. I do play with my kids in the same game on one computer though, so there is hope ;)