Effect

  LABUG
              insect mode on/off
  LACDS
              map mode on/off
  LADATA
              current map coordinates
  LAIMLAME
              invincibility
  LAMAXOUT
              gives you all items
  LANTFH
              warps to red dot on the map
  LAPOGO
              walk up walls
  LAPOSTAL
              total weapons & ammo
  LARANDY
              temporary power up
  LAREDLITE
              freeze enemy
  LASKIP
              ends current mission
  LAUNLOCK
              all the keys
  LABRADY
              full ammo
 

To Switch Levels

  Secret Code

               Level

  LASECBASE
               Level 1
  LATALAY
               Level 2
  LASEWERS
               Level 3
  LATESTBASE
               Level 4
  LAGROMAS
               Level 5
  LADTENTION
               Level 6
  LARAMSHED
               Level 7
  LAROBOTICS
               Level 8
  LANARSHADA
               Level 9
  LAJABSHIP
               Level 10
  LAIMPCITY
               Level 11
  LAFUELSTAT
               Level 12
  LAEXECUTOR
               Level 13
  LAARC
               Level 14
 

Hey Mac users! Here are two more that only work for you...

All the PC codes work for Macintosh, but there are Mac only codes too.
LATERMINATE-Makes you invincible, gives all weapons and keys, and gives unlimited amunition. A problem with this is if you
do something that would normaly kill you (i.e. falling in a pit) you can't type another code (like LAPOGO to get out)

LAOZ- turns enemies into "munchkins" and makes their voices sound the same way. More of a novelty than anything.

Andrew Bartleson, Topdawg, Thompson, Joel Pennie, and Thornbury