@Proxima : these solutions are not satisfactory for my level.
Actually I don't understand the second option.

My idea/request could add new possibilities. 

Hello.
I'm UGO a videogames french fan. I have discovered Lemmings at the beginning on the Macintosh many long years ago. Recently I have discovered at new with the NeoLemmix thanks to Guigui.

I'm writing here because I have an idea/request for the NLEditor. It's about the Talismans. It would be very great if we could add a requirement for gain it : The player must assign specific skill in the game !
I hope this is possible to add this feature.
My idea : to use this new requirement and pickups skill items in order to oblige the Lemmings to go to specific places in my level !