The Magic School Bus Explores The Solar System.
And it's the easiest of the platforming levels by far.
I remember a younger sibling playing that game. Foolishly, when he asked me to give it a try because it was too hard, I tried.
An hour later, I gave up and unplugged the computer. GODDAMN IT, I HATE FALLING TO MY DEATH!!!
In case anyone was wondering about why I was looking for examples, I was trying to come up with ideas for a level in my fangame.
Here's what I came up with. It's going to have the music from DuckTales and a Portal2 reference at the end.
Life is simple: it has no nontrivial normal subgroups.
Huh. Looks interesting enough. I suppose the Magic School Bus example isn't worth too much, although you could have one part where there's a Jump Boots item (increases your jumping height) to tempt players into grabbing, and then have the next screen have ceiling spikes that you're pretty much guaranteed to jump into if you grabbed the boots...