Mode 1 seems to make only the tip of the last line draw - like the end of a pen or paint brush. Mode 2 makes the entire line become a drawing surface like a piece of chalk. Mode 3 makes every line draw simultaneously (not just the line at the end).
x2 mode makes the last line draw from both ends at the same time.
Hope this helps.
An x and -x with 0 always = straight (slanted) line;
A quadrilateral: -90, 90, -90;
Interesting wire-frame cylinders: 1, x, -x (ex: 1, 90, -90) Higher numbers = clearer shape; you can replace 1 with 2, 3, or a decimal, but 1 yields the best results IMO.
How do you find the ACTUAL latest maps? Because I made a few (3 speedrun levels and a roller coaster one) but they're not showing up. I know that SHDoom person is spamming levels, but there's got to be a way to find the ones created by other people. If anyone reads this comment and knows how to find legit levels created by someone other than SHDoom, give me a shout.
 "Draw and Guess Multiplayer"){kind=icon}
 "Geosketch Two"){kind=icon}
 "GeoSketch"){kind=icon}
 "Sandbox Hero"){kind=icon}