Cheat mode (demo version):
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Use a text editor to edit the "Input.xml" file in the game directory. 
Add the following lines at the end of the file: 

[ /nowiki]
[ input Command="cheat menu"]
[ key Code="41" /]
[ Activation Type="first active" /]
[ / Input]
[ /nowiki]

Press ^ during game play to display the cheat menu.