NetHack

Cheat Codes:
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Start the game with the "-D" command line parameter. Then, enter 
"wizard" as a name and start the game. Enter one of the following
commands to activate the corresponding cheat function.

Code                 Effect
-----------------------------------
#conduct          - Show more info than usual
#enhance          - Enhance any skill without practice
#levelchange      - Change your level from 1 to 30.
#monopoly_control - Control monster polymorphs.
#lightsources     - View all mobile light sources
#seenv            - View seen vectors
#stats            - View memory statistics
#timeout          - View timeout queue
#vision           - View vision array
#wmode            - View wall modes
^e                - View all doors and traps
^f                - Full map
^g                - Create a monster
^i                - Identify all inventory items
^o                - Reveal location of all special levels
^t                - Controlled teleport
^v                - Controlled level-teleport
^w                - Wish for anything
^x                - View character description and attributes


Cheat:
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With this cheat, you can multiply items for all your saved games!
It doesn't matter what charactor, what name, whatever.

Lets say you put a great item on dungeon level 1, copy the file:
"Levels.1" to another directory, lets say: 
"c:\levels" and your nethack directory is "C:\NetHack"
Go back to level 1, pick it up. go down the stairs. 
Copy levels.1 from "c:\levels" to "C:\NetHack"
You can go back up the stairs to level 1, the level will be in its
exact state!

This usually doesn't work on pets and monsters, they can become frozen.

I suggest using this cheat on gain level potions, gain ability potions,
and gain energy potions, and unique items. Using this with a polymorph 
ring and a polymorph control ring will turn you into anything you want!
If you turn into a female of the species, you can lay and egg and get a
strong pet by raising it! Personally, I like green dragons.

I will provide my saved game and a sample levels.1 file. To use them,
change the first word in the saved game file to your username, if there
is none, it is (null).