Cheat mode:
Press [Ctrl] + [Shift] + [Alt] + D during game play, then press ~ to display the 
console window. Then, enter one of the following codes:

Effect - Code 
List commands - showcommands  
Get everything - giveall  
Instant construction - df_buildinstantobjects  
Display help - help 
Get indicated amount of money - money   
Set minion population - setmaxpopulation  
Take away everything - takeall  
Unlock the glossary - unlockglossary  


Cheat mode (demo version):
Press [Ctrl] + [Shift] + [Alt] + D during game play, then press ~ to display the 
console window. Then, enter one of the following codes:

Effect - Code 
List commands - showcommands  
Get everything - giveall  
Instant construction - df_buildinstantobjects  
Display help - help 
Get indicated amount of money - money   
Set minion population - setmaxpopulation  
Take away everything - takeall  
Unlock the glossary - unlockglossary