In my opinion, it saves ~90 seconds and is the easiest way to complete World 4 on Rage-Mode

Link -

How to do it?

Before trying to make a skip, I take align (you can see it on my clip), then I make a short press to the right for 1 frame to change my align. The next step is to enter the right border of the screen so that I am in the left part just above the bottom surface. If this could not be done, then you need to repeat the previous step with taking align. When you have successfully managed to do this, you need to press the left button for 1 frame a certain number of times. When you are stuck enough in the upper block, you will be able to hold the right arrow button and also climb up. This should be done until Boshy's legs are at the level of the lower border of this block. Next, you need to press the left button for a while and you will fall off the screen