https://powdertoy.co.uk/Wiki/W/Variables.html is also just as useful as the link above. Also yeah, the coding tutorial is pretty awful right now, it cuts off right at the point you need, so there really isn't much right now ... I should finish it.
@wolfy1339(View Post) I don't know about coding, but making it breakable by gravity into BREL by copying the code from BMTL seems like a logical solution.