yea, the world is private unless you tick the "launch server" option.

snapping get weird when you get more in depth, as door frames add three snap layers where a wall by default has only one. You are better off making solid walls then cutting the doorframe out after.

Also your fine snapping control gets better the closer the camera, so you might need in some instances to scroll camera in, then take out hammer to build as you can't change camera when holding the hammer.

Finally, in some hard to reach angles, you can use the "sit" option to lower your camera angle to help snap things underneath others if you are having problems :)


edit: forgot to mention just in case, by default snapping is on, holding the snapping button turns on free place. at one point I don't think that was the clearest but i think it's been clarified on the GUI now