Level select
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding.
Using a text editor, edit the "mission.dat" or "mission.cfg" file in the game directory. Replace all characters in the file with "1111111111". Then, any level may be selected for game play.

Cheat Codes
While playing a game, type "thunder" or "winter" (for v.1.51) to enable cheat mode. If you entered the code correctly, an exclamation mark will appear. Then, enter one of the following codes to activate the corresponding cheat function:

Additional HQs
Enable cheat mode. Clock on any flat area suitable for a fortress that is not controlled by yourself or an opponent. Then, an option to build a HQ will appear.