Lemmings 3 Level Files Documentation
  by Mindless and geoo89

(all data is stored in little-endian words, i.e. 2 bytes per field, unless otherwise noted)

LEVELS\LEVELxxx.DAT
  0x00  -- lemming style  (0x04 -> classic, 0x0a -> shadow, 0x05 -> egyptian)
  0x02  -- refers to GRAPHICS\CAVExxx.MAP files  (never used)
  0x04  -- refers to GRAPHICS\CAVExxx.RAW files  (never used)
  0x06  -- refers to LEVELS\TEMPxxx.OBS file to load  (destroyable objects)
  0x08  -- refers to LEVELS\PERMxxx.OBS file to load  (undestroyable objects, skills, extra lemmings)
  0x0a  -- level style  (0x01 -> classic, 0x02 -> shadow, 0x03 -> egyptian)
  0x0c  -- level width  (in pixels, must be divisible by 4, min: 320, max: 1280?)
  0x0e  -- level height (in pixels, must be divisible by 4, min: 160, max: 400?)
  0x10  -- start x position  (in pixels, must be divisible by 4)
  0x12  -- start y position  (in pixels, must be divisible by 4)
  0x14  -- time limit  (in seconds)
  0x16  -- (byte) number of extra lemmings
  0x17  -- ???
  0x18  -- release rate
  0x1a  -- release delay
  0x1c  -- number of enemies

LEVELS\PERMxxx.OBS, LEVELS\TEMPxxx.OBS
  0x00  -- object 1 id
  0x02  -- object 1 x  (in pixels, must be divisible by 8)
  0x04  -- object 1 y  (in pixels, must be divisible by 2)
  0x06  -- object 2 id
  0x08  -- object 2 x  (in pixels, must be divisible by 8)
  0x0a  -- object 2 y  (in pixels, must be divisible by 2)
  ....  repeat for all objects (minimum of 1 object, maximum of at least 512)