This is a demo that I made for R. R tends to turn right or fall itself when it encounters a metal that's half-block away horizontally from the metal's original position. It is highly recommended to move the budgeable when R is not standing on it. First part: R will turn right from the stair block to the metal that's half-block away from its original position. Second part: R will fall after it walks on the metal that's half-block away from its original position.
@Ray Aznable The first part is similar to the accidental shortcut that I did in @Meko Guy 's Castle Run. I was lucky to move the budgeable half-block away.
@P_simorf - I've been making levels using half blocks for some time now. Here's a small easier one: https://mekoramaforum.com/media/win-with-b-alive.19807/ Here's another using a trick that I found called 'Leading Edge' https://mekoramaforum.com/media/try-leading-edge.16734/