I tried a couple more mods:
blood445_MOD.dat
Level 1: This level is only about fighting guards.
On levels 2-4, parts of the original levels are recognizable.
Level 2: The first half is full of green potions. There are flip potions at places where you would step. The guards are hard, but the level is otherwise straightforward.
Level 3: Easy.
Level 4: Unfinishable?
Single screen prison.zip
Level 1: As the name says, this level has only one room.
(Well, there is a second (empty) room, but the kid immediately falls into the first and you can't go back.)
The exit door is opened by a closer, but it closes a gate that is between you and the exit.
I don't know how to finish this level.
eagleset.dat
Level 1:
The idea of the first part of the level: There are two series of gates and open buttons in two distant rooms.
(There is a loose floor above each button.)
Each button opens the next gate in the other room.
There is a bug on the level: Event 4 points to a loose floor. It should point to the gate on the right side of that loose floor.
(Something similar happened with 4D PoP and
Leteipa.)
I got stuck: At the green guard, there is a button that opens the gate behind the yellow guard.
But I can't get past the yellow guard, he always turns left and pushes me off the ledge.
Level 4: This level is unfinished. It doesn't even have an exit door.
ilkka_LEVELS.DAT
Level 1-2: Long levels. Both have one big potion.
The button that opens the exit is far from the exit on both levels.
7yearslater_mod1.rar
This one comes with a modified EXE that says "Good Luck" instead of "Loading", gives only 35 minutes, and enables some tiles.
These levels are shorter than those of the previous mod.
Level 1: In one room there are 9 chompers.
Level 2: This level was changed to palace.
Both levels need some loose floor tricks, and both have gates that must be opened early, or you'll get stuck at the end of the level. (Remember the original level 9?)