Thread:Hackey5/@comment-33081060-20180405123412/@comment-25406802-20180407110717

http://geometry-dash.wikia.com/wiki/Geometry_Dash_Wiki:Sandbox?useskin=oasis is the link what you wanted?

If I am correct, the sandbox is a page in which anyone could use for testing some script/code of their own as long as they are not interfering with others, which is why it is divided with ---.

Also, the "achievement" that said "unlock no badge" was made on its own for fun. It doesn't actually exist.

Hope that helps.