15/25 Mayhem levels are confirmed and completed succesfully without pausing game
Levels 3-11 all are done (Levels 1 & 2 spending confirmation) Both are building levels, but i have to check out blocker things later. Also here might not are troubles levels 12-14.
-Level 16 is surely impossible. Its will required use pause button at least few times. I think its not even theory possible make this cursor moving quick enought

-Level 20 might are possible, but its will be even more harder than mayhem 19. Its really hard level even with pause used.
All end game levels 21-25 is confirmed (expect im not are played level 22 yet, but for sure its possible without pausing. I´ll confirmed it later.
 
https://www.youtube.com/playlist?list=PL-Cn2MW-VOj0LTlBuyajKU0H-7fmYxmdo

I´ll probably play and post all Fun difficulty levels in Archive org later. Im not going post all most easiest levels in youtube.

Rightnow its seems Mayhem 16 Hello John got a new lemming is only totally impossible level without pause button and probably mayhem 20. Let see..... Mayhem 20 building and blocker switch might are at least theory possible make correctly. Not sure did i can make it with human hands.

Clock are 5 am so i´ll back my progress later. Have to sleep little bit.

NES Lemmings
Mayhem 19 How much more can you take pause free completed. That was some seriously hard one. Its hard level even with paused used. How ever i dying a lot attempt break that last blocker, that was pretty nice task.

I recorded it with fceux emulator, but no cheats used. All played real time and also real NES controll used.
https://www.youtube.com/watch?v=OMF7tgvWXng&ab_channel=metroidmaster88

About other levels. I think here is few levels which will required use mandatory pause button. Just at least Mayhem 16 level; Hello John floater/digger switching is for sure impossible one.

EDIT:
NES Pause free challenge solutions playlist. Those are random order and i am did some my favorite levels. I`ll add levels when i will make this. I really inspirated with this one, when i did Mayhem 19 pause free madness done.
Currently up
Mayhem 3
Mayhem 18
Mayhem 19
Mayhem 21
Mayhem 23
https://www.youtube.com/watch?v=s2R6In4U6CE&list=PL-Cn2MW-VOj0LTlBuyajKU0H-7fmYxmdo&ab_channel=metroidmaster88

Lemmings NES (also recorded tutorial guides all 100 levels)
Lemmings SNES (This is game is totally busted. All levels are max pointed & also whole game is pause free completed)
Lemmings Sega Genesis (few times completed, also recorded some challenge solutions)
Oh No more Lemmings DOS (actually did my 2nd completion a today. Start play it yesterday and total 16 playing hours (8 hours only in Havoc mode). I did my first completion somewhere over 2 years ago thats take even longer time then.

LOL Genesis version could make 4 Skills 100% solution Fun level 11 Keep your hair Mr lemmings.

I make several testing yesterday on SNES, but SNES miner mechanism not like work like this. You can make 4 skills completion solution on SNES version use basher, but then you cannot turn climber lemming to back so its will fall to death.

https://www.youtube.com/watch?v=2WIa7Oc5OgY&ab_channel=metroidmaster88

SNES Could be done 5 Skills solution with several ways, but because thats miner doesn´t want break that wall 4 skills seems impossible.

Snes
5 Skills my first one
https://www.youtube.com/watch?v=knoHqEmcAvs&list=PL-Cn2MW-VOj2iavqxLhsm1cPpoklWfqch&index=11&ab_channel=metroidmaster88

Snes
5 Skills alternate 2
https://www.youtube.com/watch?v=ijrlheCdpAg&ab_channel=metroidmaster88

Snes
5 Skills alternate 3
https://www.youtube.com/watch?v=8xGP844ylbU&ab_channel=metroidmaster88

LOL

That old joke/myth. Lemmimgs cannot be played without pausing. I already beated game without pausing. Now I´ll try all hardest max-% without pausing. Most seems very easy. Some are impossible and some extrelemly hard, but possible.

All thanks Willlem who create this topic. This really motivated me back my favorite game. When i did done my Max- Score challenge i have to find some new ones.

Current youtube pause free play videos are updated: Also level challenge type & difficult level is added

https://www.youtube.com/playlist?list=PL-Cn2MW-VOj2YNbyy2bnaMN-LmTAKb77u

Current challenge into list:

Type: Completion, 100%, Speedrun, Challenge
Difficulty: Extremely Easy is easies & Extremely Hard is hardest. Im not are post easiest levels.

Taxing 22 Come over to my place 100% completion solution under 1 minutes
Type: speedrun/completion)
Difficulty= Easy/medium)

Taxing 26 Triple Trouble 100% comletion
Type 100% completion
Difficulty= Medium

Taxing 30 We all fall down completion
Type 100%, completion, Speedrun, use All diggers
Difficulty= Medium

Mayhem 1 Steel Works
Type 100% completion
Difficulty: Medium

Mayhem 5 Down, along, up, In that order
Type: Max-% 76/80 saved
Difficulty: Medium-Hard

Mayhem 9 Curse of the Pharaohs
Type 100% completion
Difficulty: Medium-hard

Mayhem 10 Pillar of Hercules
Type max-% legacy  71/75 saved
Difficulty: Medium
Other: 72/75 version is completion done rightnow

Mayhem 15 Fast Food Kitchen
Type 100% completion
Difficulty: Hard

Sunsoft Special 3
Type completion solution
Difficulty: Hard

Sunsoft Special 2
Type completion solution
Difficulty: Medium/hard

Sunsoft Special 4
Type: completion solution
Difficulty: Medium

Sunsoft Sepcial 5
Type completion solution
Difficulty: Medium

Tricky 25 Cascade
Type 100% completion solution
Difficulty: Hard

Mayhem 18 Then There Were Four
Type 100%, Speedrun solution (6:30/9:00 time remain)
Difficulty: Medium

Mayhem 29 Save Me
Type Max-% completion 97/100 saved
Difficulty: Very Hard

Taxing 28 POOR WEE CREATURES
Type Max-% completion 90/100 saved
Difficulty: Very Hard

Taxing 2 Watch out , there is traps about
Type: 100%-% completion & speedrun over 3:30 time remain
Difficulty: Medium/hard

Taxing 10 Izzie Wizzie lemmings get busy
Type: Speedrun Under 1 minutes
Difficulty: Medium/hard

Tricky 22 Turn around young lemmings
Type 100% solution
Difficulty: Hard

Tricky 23 From The Boundary Line
Type max-% completion legacy 97/100 saved
Difficulty: Very hard
Other: 99% version is completed

Mayhem 11 We all fall down
Type: Challenge completion. Use all digger
Difficulty Medium

Taxing 29 How do i dig up the way
Type 100% speedrun solution (goal under 2 minutes)
Difficulty Medium

Mayhem 2 The Boiler Room
Type Max-% 99/100 saved
Difficulty: Medium/hard

Taxing 27 Call in the bomb squad
Type: Max-% 97/100 saved
Difficulty: Hard

Mayhem 21 With a twist of lemming please
Type: Challenge (1st lemmings have to climber=
Difficulty: Hard

Tricky 24 Tightrope City
Type 100% speedrun (in 1 minutes)
Difficulty: Medium/Hard

Mayhem 30 Rendevouz at the mountain
Type 100% speedrun. (under 4 minutes)
Difficulty: Medium

Taxing 21 Feel the heat
Type Speedrun (under 1 minutes)
Difficulty: Easy/medium

Taxing 22 Come on over to my place
Type Challenge (no floaters or blockers is allowed)
Difficulty: Medium

Mayhem 18 And Then There Were Four
Type: Max-% & Challenge. 100% saved builders only allowed to used
Difficulty: Hard


Mayhem 25 Have a nice day
Type: 100% speedrun (under 2 minutes)
Difficulty: Medium

Mayhem 26 Steel Mines of the Kessel
Type: Max-% 95/100 saved
Difficulty: Medium

Tricky 23 From The Boundary Line
Type: Max-% 99/100 saved
Difficulty: Extremely Hard

Mayhem 10 Pillars of Hercules
Type: Max-% 72/75 saved
Difficulty: Extremely Hard

***********************************************
Archive org list includes even more levels. Some are probably way too easy to show youtube public video. But if you guys wish some levels. I´ll promise make. I personally have two extrmely difficult challenge remain. Just Taxing 16% 100% & Mayhem 19 48/50 saved without pausing, might be super hard ones.

But other challemges is also welcomed. My peronsal favorite was Willlem Mayhem 21 1st climber challenge. That was just fun and hard one too.

Rightnow i think i´ll play some easier 100% pause free challenge up in archive. I think my next serious progress is Mayhem 19 (2-lost) 96%

Here is pause assist version. This surely could be done without pausing. But i count 10 pixel timings in row.
https://www.youtube.com/watch?v=IGyKtVRqW1s&t=20s&ab_channel=metroidmaster88

So i´ll pretty sure 3 lost Mayhem 10 pause free could working using that way.

Mayhem 10. 72/75 glitch free (also pause assist with this time)
https://www.youtube.com/watch?v=lkID12FIeP8&ab_channel=metroidmaster88

Finally make correct starting without pausing. That is probably most hardest part. Really fast reflex requires.

https://www.youtube.com/watch?v=-R3ZsWPLZQ4&ab_channel=metroidmaster88

How ever i think i want make my solution little bit easier. When i looked better my pause assist version i think i can avoid two pixel perfect timing at end. 1 ST: use builder turn climber and thats let you one more basher remain and cost one more builder. 2ND you can use basher cancel the builder middle of the pillar. Its cost extra builder, but its look my pause version let 2 builders remain so its allowed. Then i can at least avoid two pixel perfect tricks at end.

This look this basher roulette manipulation at end cannot be avoid. Its just better are luck when make it. But i might still check out some release rate things.If i can compress lemmings better, im not need that pure luck at end. Its make this much less painful.

But for sure its strongly look 3 lost route will happen without pausing.

I think i have to keep just trying this like fucking hell.

Extremely impressive!

Nothing lucky about it, you persevered and the practice paid off! This is excellent stuff, I can imagine how that must have felt to nail it eventually

Well done!!!

Thanks guys. That was definitely my hardest stuff i ever done pause free. I was pretty close give up with this. But luckily not give up. But totally take around one week to practice that. I already did 97% which allow some pixel errors and that was very hard one too. Making 99% is just masterwork. I am glad i finally make it.