Everything Comes in Twos? - The only differences here between your solution and mine is I used the climber to bomb inside the stack to release the crowd, as well as platforming to the exit first and then stoning to fill up the gap. However, all the main tricks are there, and this is essentially the same as the intended solution, so this is perfectly fine by me!
I believe you are correct about cloning the builder to make a safe drop for the crowd being one of the most difficult things to see in the level. Also realizing that you only have one chance to bash through the OWW to release the crowd, as once the builder and the clone are done, there's no way for the athlete to get back to the area to bash them out, since he will always land on the floating platform where the masher trap is, and when he drops down from it he glides in such a way where he DOES NOT hit the wall and goes back to the left. Even if he did, as I said before it's impossible to get back there to bash the crowd out due to the slanted platform blocking the climber. Finally, the crowd will always make at least one round back to the top and hence the splatform is absolutely necessary
As you might have seen too, I threw in plenty of red herrings here that can trip people up when solving this level. For example, using a builder to get to the triangular slope on the left side and then using a platformer to get to the exit could certainly work. HOWEVER, how would the crowd get to the exit now that you used that platformer? Also, by attempting this you'll always be at least a skill short. Most importantly, the exit platform is JUST out of reach, being a few pixels too far to seal with a platformer
Thanks for the positive feedback on my R1!
I really wanted to avoid using pickups for backroute fixing just so it makes it very clear that the X-of-everything rule is satisfied with the level, but alas as I unfortunately found, backroutes have resulted
Cross Over Into the Light, My Lems! - Yup, you are correct in figuring out that missing 1%
The trick I wanted to enforce here was making the solver realize that you must make the miner bash before he breaks through the tiny pixel floor where the two triangular slope terrain connect, as well as going through the main structure with the pipes. The trick with using a builder to extend a miner and the slopes overhead to keep a basher going, I got inspiration from Icho's level "Night of Nights" from Reunion, which is one of my all time favorite levels from that pack!