Is there any documentation on how CustLemm loads its levels?
I would like to know the order in which this is done.
I'll do a little testing in dos-box
CustLemm modifies the level selection logic on the main menu. It always reads levels from levelpak.dat and assumes there are exactly 10 levels there. The part of the main menu that lets you select the difficulty ratings (eg. Tame, Wild, etc.), in CustLemm it instead lets you jump to levels #1, #3, #5, #7 and #9 respectively. CustLemm also implements a "SKIPLEVELS" cheat code.
The level order is therefore exactly the order they come in levelpak.dat itself.
I'm not sure if I understand completely.
CustLemm gives (I believe) some cd rom error. so I cannot see it myself yet.
Try nocdlem.exe (CustLemm with CD requirement removed)
http://www.geocities.com/guestlevels/lemmings/nocdlem.zip
Allright. It works. Thanks very much!