Played through the Pleasant and Sinister rank (as of v. 0.9.2). Attached replays to the Sinister rank; some are of older versions but should work with 0.9.x.
The levels were generally fun and I really enjoyed them. They had a really nice mix of interesting mechanics with classical gameplay. Only the crowds sometimes didn't seem to work out (though there were interesting uses as well): Sometimes at the end of a level I only had to assign the same skill over and over again.
These were really nice easy or introductory levels.
"We all jump across" was a nice introduction to the jumper but it seemed to have a bit too many lix.
Similiarly "A Soft Landing", which was a nice presentation of a splat height prevention mechanic but in the end I was then just assigning climbers at the hatch.
I really liked "Alternative cancellation", which was a nice introductory level.
The hardest levels relative to this rank were for me:
"Leader of the pack", "Walking in a winter wonderland" and "Lost underground".
In "Lost underground" it was not clear to me that the ceiling was made safe, which made it more difficult for me to find the right solution.
I liked these levels as well; it was a soft rise in difficulty.
I sometimes abused stair/platform stretching; I don't know if that was intended.
"Scared of heights" and "Movement denied" had interesting uses of crowds.
"Run Forrest!" had an interesting concept and was very explorative.
"Scaling the heights" seemed to be a bit finicky.
I don't know if it was intended to use the jump mechanics that way in "A factory Full Of Fools".
"7up" and "Totally Serial" seemed quite precise, though the latter one was quite interesting.
I really liked "Unstable Experiment".
In "Infinite probability" I had problems to handle all the actions I had to do.
For "Holly Jingle?" I have two solutions: one is a bit hacky, one is quite precise.
I have the impression that "Step Over, Step Out" is not intended.
Slow approach" and "Depths of the ice cave" seemed a bit easier to me.
The hardest levels relative to this rank were for me:
"The leaning tower of Lixa", "All for one, one for all", "Bridge over troubled water" (though I really liked this one),
"World 2-24", "Heat Treated"
I have played through all of Perplexing (as of 0.9.4) and attached the replays. "Division Compromise" unfortunately got a 5min-replay. For the one in the zipfolder I deliberately delayed the last action, so that it completely verifies but I've attached my original 5min-replay as well.
The beginning levels were only a soft rise in difficulty but then it got harder and sometimes very trick oriented, sometimes very out of the box. The levels generally seemed more to the point with a more tailored skill set.
The levels were generally enjoyable and interesting as well.
I don't know if I backrouted "A taste of the things to come".
"Division Compromise" used a very interesting trick; similiarly "Hunt the... Polar Bear?"
"Obvious? Maybe not." and "Step to the Beat" felt very tight.
"Somewhere only we know" was fiddly in the sense that you only know afterwards where to do the right assignments.
I liked "Pyramatic".
The hardest levels for me, I think, were:
"Burning for you", "Central Cavern", "Division Compromise", "Finding the Safety Net", "Hunt the... Polar Bear?", "Obvious? Maybe not.", "Pyramatic", "Step to the beat"
I have solved all of the Nightmare levels (as of v. 0.9.4). These were really generally the tougher levels. But I never got really stuck and it kept interesting to think about these.
I'm not sure if ""Hate leads to suffering"" is intended, it just somehow worked out. Similiarly "The Torture Chamber", "Concrete solution" and "Make Haste".
I needed for my solution to "Hello darkness my old friend." a not fully obvious frame perfect assignment.
Re "Loopback" - Why do first levels of hard difficulties always belong to the harder ones of this difficulty.
The level "Speechless!" really deserves its name. It was extremely precise and if the blocker placement was messed up, the whole level had to be redone.
I liked:
"Can you handle the heat?", "I Hate Clowns!", "Quote: "That's a nasty level"", "Quarantine", "The candy shop"
The levels that felt easier compared to the others were:
"Build me up buttercup.", "Head to the South Pole" (this one really seemed too easy), "I'm blue ... dabadee", "Method Revoked", "Qurantine", "Tribute to M.C Hammer"
The levels that were harder for me were:
"A Class Act", "Hello darkness my old friend.", "It Doe__sn't seem to fit?", "Loopback", "Make Haste", "Speechless!", "The Queen, Maid & Peasant", "Under my wing", "You'll never fool me again"
Here's an extra solution to Baywatch that is unlike Forestidia's or Nepster's. Is this a backroute? Otherwise, I'll add it to the proof collection.
My solution sends only a worker over the top, the crowd goes home via the bottom.
-- Simon