I put a few codes into my new game (TGX-1, estimated Demo Release Date, 27th December 2002, plug plug =P). They are just hidden verbs that can only be accessed through the command line.
I also plan on adding some 'secret shortcuts' too a couple of levels (Just stuff like if you blow up a certiant turf, it opens a passage to another level).
It's a solo game, so dont worry it wont be ruined by some jerk who know's the 'God Mode' Code. The Ranking will also be disabled from the second you turn the code on, until you either A) Clock the Game, B) Disable the Code and/or Die, C) Reboot the world.
So what's your oppinion on passwords, cheats, codes and secret tricks in BYOND Games? Have you got any in your games?