Rex Nebular

To activate cheat mode, you must first either 
start a new game or restore an old game. Next, 
press the CTRL key and hold it down. While 
continuing to hold down the CTRL key, type the 
letters W, I, D, E, P, I, P, E in sequence. 
When you are finished, a grey box containing 
the message "Cheating Enabled" should appear 
(if it does not, try again from the beginning--
you must have missed a key). Once the grey box 
appears, you can release the CTRL key. Then, 
press the SPACE bar to clear the message from 
the screen. You are now in cheat mode!

Cheat Mode Options

Once you have entered cheat mode, you can 
teleport yourself to any location in the game. 
To do this, press the CTRL-T key. A grey box 
will pop up and ask you where you want to go. 
Just type in the proper room number and "poof" -- 
you're there. The tricky part, of course, is 
finding out the proper room number. If you 
type in an invalid room number, the game will 
abort with the error. Here is a list of valid 
room numbers that you can try:

Section 1:  (Underwater)
  Slippery Pig: 101, 102, 103
  Underwater: 104, 105, 106, 107, 108, 109
  Cave: 110, 111

Section 2:  (Island)
  Island South: 212
  Island East:  208, 209, 203
  Island West:  207, 211, 210, 205
  Island North: 202, 201
  Witch Doctor: 214
  Twinkles:     215

Section 3:  (Underground City -- Medical Complex)
  Capture Scene: 301
  Death Scene: 304
  Air vent: 313

  Interrogation Room: 318
  Player's Cell (before havoc): 307
  Player's Cell (after havoc):  357
  Guard station (before/after): 311/361
  Gender Bender: 316
  Intersection (after): 354
  Vault room   (after): 352
  Teleporter room (after): 351

Section 4:  (Underground City -- South Annex)
  Scanner Corridors: 401, 407
  Other Corridors: 405, 406
  Wanda's Bar: 402
  Armory: 408
  Storage: 410
  Laboratory: 411
  Teleporter: 413

Section 5: (Machopolis Lower)
  Arrive: 501, 551
  Security: 503
  Software Store/Lab: 506, 507, 508
  Restaurant: 511, 512
  Elevator: 513

Section 6: (Machopolis Upper)
  Bruce's Place: 601, 602, 603
  Sea Window: 604
  Abdul's Auto: 607, 608
  Buckluster Video: 609, 610
  Hermit: 611
  Williams Bypass: 612

Section 7: (Machopolis Rim/Governor's)
  City Rim "before": 751, 752
  City Rim "after": 701, 702
  Sea Monster: 703
  Bottle: 704
  Outside Penthouse: 705
  Governor's Penthouse: 706

Section 8: (Space Port)
  Control Station: 801
  Landing Pad One: 802
  Landing Pad Two: 803
  Inside Ship: 804

You can find out what "room" you are in at 
any time by pressing CTRL-P. The grey box 
which appears will tell you the current room 
number (among other things).