I too tend to like builderless levels, and spotting these was actually rather exciting.
Here are some builderless custom levels listed like this:
"
CreatorLevelpack: title of a level"
Builderless levels of some great Lemmix level makers:
BulletRideBulletRide1: Ignition
BulletRide3: Just a Reverse Minute
BulletRide5(ver3): Cut to the Quick
Clam SpammerClamSpam01: Dig This!
ClamSpam02: Cut the Red Wire, Get Out of the Pool!, A.T. on an Angle, Stay Out of the Pool!!!
ClamSpam03: Barrel o’ Laughs, Turning the Screws, The Dying Seconds
ClamSpam04: Flotilla, Dropout, From the Brink
ClamSpam05: The endless steps (a large builderless map)
ClamSpamXmas10: A.T. on a shoestring
- Also 8 builderless challenge levels in CSTame packs
Ellischant (Eymerich)E3Levelpack_F: Minimal Trouble
finlayfinpak01: Chrysanthemum paradise
Garjen (J. Gareth Moreton)GARJEN09: Faithful Friends
geoogeooPk0: crossing stairs
geooPk1: More 'No Builder Problems'
- Also 4 builderless glitch levels in geooPkG pack
-H0ru5-elfpak01: Fortress 13 (a large builderless map)
Insane SteveISteve03: A Towering Proposition
ISteve06: It's Hammer Time!
ISteve07: The Annoying 1-pixel Gap, Bash and no time (the first one is a LAAAAARGE builderless map)
ISteve08: I Traded Them for Climbers
ISteve09: A BeastIV of a level, Undermined, NO MAS!
Martin ZurlindenMazuLems: Fallout Boys
namidaLemmings DOS Plus Project: Just Walk!, Take Your Time…, Blow Down!, Fast enough?, Ready, Aim, Fire!!!, Safety Blast, Fallen, The Lonely Pole, Six Feet Under, Backdraft, Unholy Staircase, With A Quirk Or Two…, Antigravity, Phase Rotation Syndrome, The Deadly Climb, To The End! (the last one, which Proxima already mentioned, is an excellent example of a difficult, large builderless level)
siergiejSiergiej01: Tower of insomnia, The ephemeral labyrinth, The scaffold (the last one is a quite lengthy level)
Thick Molasses (möbius)TM pack 1: Afraid of Heights
TM3: A Towering Tower
tseug1tseug: Rush Hour (well, möbius already mentioned this)
YawgYawg06: Turn it Around!
Builderless levels of some Lemmini level virtuosos:
DodochacaloDoveLems: Plain rating levels 1-5 and 7 are builderless tutorial levels, Disappearance ?, Bashers are Back !, It’s Not an Illusion !, Lemmings-Digging Iron Plates, Molotov Cocktail and Co, Art of Mining, It’s an Evil Symphony !, One-Way Traffic, La France, Imposing Block
FranLems: Doux rating levels 1-3 are builderless tutorial levels, Art Moderne
GronklingGronklems5: Drifting Away…, Optical Fibre Land
LacktardoThere's no eye in team (doesn't belong in any levelpack as far as I know)
PieuwPieuw01: Bricky Madness, Descent into Hell
Pieuw02: The Magic Box
30levelspack(Pieuw): Hugs & Kisses, The Drowning Walk
- Other builderless levels by Pieuw that don't belong in levelpacks: Triumph For Their Magic Picks, Off-Centered but yet in Focus, Straight Forward