Reinstalled RTW and looked at the pack. Some levels are still partly or completely copied:
Level 28: start taken from Platinum level 10, end from Platinum level 11, turned 90 degrees.
Needs changing.
Level 30:
REDESIGNED verison of an end puzzle of some other level (I don't remember right now).
Can stay the way it is.
Level 37: start is a
REDESIGNED version of W3L3 from the original Wonderland. There are more coilies, making it impossible to kill all of them without messing up the level. Nice touch.
Can stay the way it is.
Levels 38 and 44: this reminds me of "Mirror Image", but
REDESIGNED completely.
Can stay the way it is.
Level 46: this is Platinum level 16, replacing Stinky with Qookie and adding Stinky, Loof and Peegue near the exit. The 3D effect is taken out, making the level easier.
Needs changing.
Level 50: this is "The Hedge Maze", a custom level by Midnight Synergy.
Needs changing.
Level 51: this is "Hide and Seek", a custom level by Midnight Synergy. I haven't tested for changes inside the maze, but the layout is too familiar.
Needs changing.
Level 52: this is "Bowling for Coilieys", a custom level by Midnight Synergy.
Needs changing.
Level 54: Platinum level 07 (even the name is the same!) with all four characters and four transporters, one for each character.
Needs changing.
Level 55: Second half is Platinum level 12. First half is interesting.
Second half needs changing.
Change these 7 levels or find some big boxes to hide behind!!
The rest look original, though not all of them are equally well designed. Unlike Amnon, I can run "Fear Center" at playable (but not completely smooth) speed, so I can play it.
"Thinking Way" doesn't look possible at the moment, but I haven't spent enough effort on it.
For MINERAYMAN: if you want to know what to do with other people's layouts, check out my "Deja-Vu" levels. There are three of them, based on W9L1 from the first Wonderland game, on Platinum level 6 and on Platinum level 19 respectively. I have changed a few tiles in each of them, but the original solution
does not work anymore. You have to find a new, much trickier one that's totally different.
I have once copied a small part from Mark's "Dance Macabre" and even though I gave credit, I still regret not putting my own creative spin on it. I did put my own creative spin on two other levels based on Mark's designs: "Spherework" was based on "No Bugs, My Lady" and I think it was the way I originally solved the level (or not? I don't remember) and "Rolling Sokoban II" is based on "Rolling Sokoban". Both times Mark gave me permission.
Actually, I think I didn't ask his permission for the "Dance Macabre" part (although it's a small one and I did give credit) but let's not ruffle sins of the past.
EDIT: Also, level 49 has BIG similarities to "Wonderland Exploration", a custom level by Midnight Synergy. Not sure if the redesigning here is enough.