The 3 pixels that a lemming "walks" down, are included in the 60 pixel drop. so it's 60, not 63.
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There is an indirection table for levels. So when on level (say 4), it might tell you to load level 15 instead.
Below is the table I have. The numbers have to be divided by 2. If the bottom bit is set, then its a duplicate, and it gets the new skills from an "odd table", which is loaded in from "ODDTABLE.DAT".
These are levels that have new skills to make them easier. So if the indirection table has the bottom bit set, its a duplicate level, with overidden skills. The PD version, doesnt use an indrection table, and while the data disk does(Oh NO!), it doesnt use the odd table.
; Fun Levels
A0; A0; A0;db A0; A0; A0;147,155,157,149,151,153,159,14,22,54 A0; A0; A0;
A0; A0; A0;db A0; A0; A0;70,16,29,32,38,42,48,72,84,104
A0; A0; A0;db A0; A0; A0;138,23,68,96,98,116,78,100,108,134
; Tricky Levels
A0; A0; A0;db A0; A0; A0;1,30,36,50,52,56,58,80,102,120
A0; A0; A0;db A0; A0; A0;128,130,136,5,148,152,154,156,160,7
A0; A0; A0;db A0; A0; A0;11,13,15,17,19,21,25,27,33,31
; Taxing Levels
A0; A0; A0;db A0; A0; A0;37,39,41,43,45,47,49,51,53,55
A0; A0; A0;db A0; A0; A0;57,59,61,63,3,65,67,69,71,73
A0; A0; A0;db A0; A0; A0;75,77,79,81,83,85,87,89,35,111
; Mayhem Levels
A0; A0; A0;db A0; A0; A0;91,93,95,97,99,101,103,105,107,109
A0; A0; A0;db A0; A0; A0;112,113,115,117,119,121,123,125,127,150
A0; A0; A0;db A0; A0; A0;129,9,131,133,135,137,139,141,143,145