Let's start with the records we posted at the "
Minimum skills with maximum % Challenge", which is similar to your challenge except for using PC version and not using the SNES points system. I have replaced the example table above with the one from that thread. (Note that the table is unfortunately not well-kept and some entries are wrong, I'll update them later.)
Also it's known that on the PC version, only the following levels do not have a 100% solution:
Fun 3: Lose 3
Fun 6: Lose 2
Fun 18: Lose 5
Tricky 15: Lose 3
Tricky 16: Lose 4
Tricky 17: Lose 2
Tricky 18: Lose 1
Tricky 23: Lose 1
Taxing 7: Lose 1
Taxing 19: Lose 5
Taxing 27: Lose 3
Taxing 28: Lose 10
Mayhem 5: Lose 4
Mayhem 10: Lose 2
Mayhem 19: Lose 3
Mayhem 26: Lose 4
Mayhem 29: Lose 2
Solutions that work on the PC version do not necessarily work on the SNES, but it's a good start. You can convert one of our records to the equivalent theoretical SNES score as follows ("skills" = "items"):
SNES score = rounddown((lemmings total - lemmings lost) x 100 / lemmings total) x 100 + total skills - skills used
[rounddown(x) means drop everything after the decimal point, ie. rounddown(5.99999) = 5]
Maybe if I have time, I can try to write a program to do this calculation for each level and come up with the scores.
Then you can review the scores and see which ones stick out to you as something that you don't know about, and then we can try to see if the record is achievable on SNES or not.
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And actually, although we mainly focused on the PC version, a few people including me had done a few levels in SNES versions a long long time ago (due to the ability to use savestates with an SNES emulator, a capability not available for a while on the PC-based versions). So here are some results I'm pretty sure about:
Tricky 23 lose 1 solution should work on SNES, in fact I first tested it on SNES before I was able to execute it on the PC version. If I recall correctly it uses up all but 1 skill.
Fun 17 and Taxing 6 (the repeat) 100% solution was tested to work on SNES as well as PC, the solution uses only 4 skills.
All four of the "We All Fall Down" levels were tested to be solvable on SNES using only 3 diggers. Due to difference in digger mechanics in PC version, these solutions don't actually work on the PC version but does work on SNES, Genesis, etc.
Mayhem 10 lose 2 solution should work on SNES. You do the start slightly different from PC version due to the difference in basher and the inability to change release rate while paused, but otherwise it works. Don't remember how many skills left.
Taxing 27, Mayhem 26, and Mayhem 29 record solutions reported on the PC version do
not carry over to SNES. The major difference in Taxing 27 and Mayhem 29 is that the PC version lacks the water, while for Mayhem 26, the PC version generously gives 20 each of the 3 types of skills available, instead of 10. I remember testing it some time ago and a lose-5 solution should be achievable on SNES for Mayhem 26, and a lose-3 solution for Mayhem 29.
I'll see if I can find saved movies from the emulator on some of these results above, if not maybe I'll re-make them but it'll take some time.