I am submitting several SubLems levels to this pack. In addition to all of the Retro levels (if you are interested) I am also submitting:
Sweet 4: Fun frozen over
Literally, just a repeat of Fun 11 in the Snow tileset, with fewer builders so you cannot build over the structure.
Scary 6: Lemmings in the... basement?
Lemmings in the attic, flipped upside-down.
Scary 7: It's basher-proof!
An alternate version of Sweet 4 with the one way arrows preventing bashers or miners, making it rather different from Fun 11, since it is a remake of a remake; not sure if that counts.
Scary 9: Alternate Ascension Escalation
A version of my I am A.T. remake (detailed below) with far more skills.
Chaotic 5: An evil recreation!
Another remake of Fun 11, this time in the Fire tileset and an even tougher solution.
Insane 3: Mini level marathon
A disjoint union level containing Fun 3, Tricky 18, Tricky 23, and Taxing 10
Hellish 9: I am R.T.
A remake of I am A.T. but even tougher!
Please feel free to use any of these levels or the Retro levels. All are attached.