It’s Marble Run Addons, so multiple things, so far it has:

• Off-grid brick placement

• Uploadable diagonal rotations

• Meter counter for published tracks instead of just editor

• Extends the background so that you don’t have to stare at a blank yellow background

Here’s the first version of it: https://gist.github.com/PkmnQ/bc0a10229c45f43016ea0e4756ddf523

I’m planning on adding:

• Copying published levels into the editor

• Overlapping tiles that publish properly (don’t overlap them yet, they do weird things)

• A better way to add and remove off-grid tiles

• Something that shows the path of the ball

• More rows and columns

Oh yeah and if you’re using this extension absolutely do not use clones (“BallBox”es as they’re called in the code)