This is Roblox?
thats a selection box.
Nope, it's gmod.
it is light blue by default, and you can change the color in the studio settings
thats great.
although you cant disable brick select, which confuses me when trying to align one part with another...
i ripped all half-life 2 textures and models two days ago to use mesh parts in their full potential:
the game is for kids mainly
seriosuly, get out.