Most are just very particular puzzles, but here are some examples:

• Challenge 14: "Now use miners and climbers" - Tricky 30: "The Crankshaft" but saving 100% with only 10 Climbers and 10 Miners.
• Challenge 21: "The Expanse" - Mayhem 17: "Stepping stones" but saving 100% and only 5 Builders, forcing you to not only go over the top but to be very efficient about it.
• Challenge 22: "Senseless Sacrifice" - Tricky 22: "From the boundary line" but challenges you to save 95/100, and a gold talisman if you get 99/100.
• Challenge 26: "Where angels fear to tread" - Tricky 16: "Mary Poppins' Land" but saving 100%.
• Challenge 27: "Hell's Kitchen" - Mayhem 15: "The fast food kitchen" but saving 100% with only 5 of each tool.
• Challenge 28: "How low can you go?" - Tricky 18: "It's Lemmingentry, Watson" without the Bomber.
• Challenge 29: "Christmas Rush" - Havoc 4: "The race against cliches" without the Digger.
• Challenge 30: "Tribute to the Master" - Taxing 17: "Tribute to M.C.Escher" with only the Floater and the Builders.

So most people know this already, but the 4th rank in Lemmings Cranium, named "Challenge", are 30 levels that are purely subsets of levels from Amiga Lemmings, Oh No! More Lemmings and Genesis/MegaDrive Lemmings.  Some of these challenges are rather specific with their limited toolsets, but it could be a good test to see how much you can minimise the skill usage and, in some cases, maximise the lemmings saved.

So if you're looking for 30 unique challenges based on the original game, that rank is for you!

Your solution to Paradox is fine.  Good work Icho.

All intended there erikderkovits - well done.

Update to Paradox (non-critical, doesn't fix any backroutes and existing replays should still work)

• V2:
  • Shortened metal platform on left side.
  • Trivial scenery change.
• V3:
  • Fixed some pixel-sized holes on the left wall.
  • "Painful Paradox" bronze talisman renamed to "Time Paradox".
  • New silver talisman: "Space Paradox"; use only seven skills.

Quote from: Armani on December 06, 2024, 02:52:57 PMplayed through rule 3
...

Paradox

I have a good feeling about my solution being intended
 Such a simple looking level with challenging solution. I love it

...

That's actually unintended, but I absolutely love it!  I'll definitely accept that as an alternative solution, at least for now!

@Flopsy: Yep, that's very much intended - well done!

Gronkling's solution is close enough - well done.

Quote from: NieSch on December 03, 2024, 10:01:26 AMHere's my solution to Crane's level 'Paradox'.

Such a painfully obvious backroute too.  Patched.

I have to apologise for not being able to go to this one.  I hope everyone has a great time.

Congratulations to Armani and Eric Derkovits!  All fantastic levels!

That's kind of you!  I'm sorry I left it so late.  It was only because I realised my replays don't work any more in V3 due to some scenery changes, but I recall that you said they were acceptable.

I know this isn't quite the intended solution, but I thought I should re-solve "Mr Lemmy Does Not Live Here Anymore" - it's based on my earlier solves, at least I think it is.

Version 3 of High Striker (unchanged):

- V3: Removed the thin wall, added a couple of obstructions by the pit and a 2nd Basher.
- V2: Added an extra thin wall to block an obvious backroute.

Version 9 of Tomb Raiders

- V9: Even more debris near the exit to prevent a refined backroute from Kaywhyn.
- V8: Lowered height of wooden platform over the water and added some extra debris near the exit to prevernt a backroute from Kaywhyn.
- V7: Removed sloped edge of high drop to prevent a backroute from Kaywhyn.
- V6: Raised height of first wall to prevent a backroute from Kaywhyn.  Lowered upper starting area slightly for aesthetic reasons.
- V5: Cleaned up the wooden vertical obstruction and added decoration to its left side to prevent a backroute from Armani.
- V4: Increased release rate to 80 and revised design of starting area to fix backroute from Armani.  Save requirement increased from 51 to 52.  Extra decoration on the right-hand side of the level.
- V3: Thickened the vertical wooden obstruction and redesigned the platform it connects to in order to block a pair of backroutes by Armani.
- V2: Raised the exit platform by a single pixel to block a backroute by Armani.  Minor change to water placement for aesthetic reasons.

Nice one on the solves!  I wish I could see you solving these on video... we seem to be missing that for this contest!

Your solve to "Tomb Raiders" is a backroute, but I'm impressed enough that I can't be mad, but I think I need to patch it because with some slight adjusting it's possible to save an extra lemming.

I also can't help but laugh at your solution to "Cheddar-Crusted Hash Browns" because of how simple the backroute it is, as well as being surprised that I didn't notice it myself (I found one that required a V2).