If you use some of these cheats you won't
get any experience points.
It seems that it's only important to input the
digits itself, not just in the right sorting.
Some of the combinations toggle the cheat on/off,
some don't (only toggles on).
Input all digits on the numpad:
333333 - $250,000
55555 - Full map
777 - $2,500,000
888 - Mission accomplished
Press [Num Lock] during game play and type
in the following codes during gameplay:
09921 = $250.000 Credits
09922 = Destroy all Enemys
09923 = Destroy all Enemys houses
09924 = Mission accomplished
09925 = OFF/ Fog of War
09926 = All house are big
09927 = Info about your Level
09928 = More Speed