It was this guy! I'm sure I would've gotten it eventually, but it's frustrating to continue wrangling the little guys after a certain point, especially when I had to keep restarting after getting caught in the grey path. 
It was this guy! I'm sure I would've gotten it eventually, but it's frustrating to continue wrangling the little guys after a certain point, especially when I had to keep restarting after getting caught in the grey path.
Yep, just what I thought.
I would have some levels earlier teaching about “airlocks.”
Take the pink one out of there, then push the blue and the yellow together to inside the air lock, and then bring the purple back.
Ah, that makes sense!! When I have a moment, I'll sneak back in and defeat that puzzle once and for all. Thanks!