New level: QXP-S5K-R0H
Edit: I also want to apologize for the end of the third room being tighter that I intended. This is the result of something that I think is one of several glaring flaws in Mario Maker that I'm amazed they didn't fix in MM2 (like key deaths and soft-locks), where the only way to test a level from a checkpoint is to pretend to upload it and then clear it. It didn't occur to me that there might be a difference between positioning myself at the checkpoint in edit mode and playing the level from there, vs. actually spawning at the checkpoint. But it turns out that in the former case, the camera centers on Mario, while in the latter, for whatever reason, it does not (probably has to do with a solid wall being to the left of the checkpoint, though why it wouldn't be consistent between the two cases is beyond me). So when you re-spawn at the first checkpoint, the camera actually scrolls two columns farther to the right than I had intended. I didn't discover this until after I had already cleared all 6 rooms sequentially, and it wasn't a big enough deal that I felt like redoing it at that point, but still frustrating that there's not an easy way to test for things like that...