Invulnerability:
The only god mode (or invulnerability) cheat that works is: 

SelfDefenceAgainstFreshFruit 

Note the difference: 'fruit' is singular, no 's'. That works for invulernabililty. Could 
not get 'motorhead' (supposedly Instant Kill) to work, only 'TheSpanishInquisition' 
seems to work for Instant Kill mode. 

A lot of the cheats you have listed on your site for this game do not work, at least, 
not in the N. American version that I just bought. So you might want to change 
these. I think they were just copied from other sites, and I am letting them know 
too. 

Seriously, I have been testing them all over the last hour and a half, they don't 
work, except a couple that I have mentioned. There are a few, 
like 'BicycleRepairman', that were acknowledged by the game when I typed them 
in, but seemed to have no effect. The only ones I didn't test were the points-
related cheats. Oh yeah, the instant win scenario cheat- 

'DirtyHungarianPhrasebook' 

- does, in fact, work.

Cheat Codes:
While playing, press [ENTER], then type any of the following codes: 

Code - Effect 

SELFDEFENCEAGAINSTFRESHFRUITS - God Mode for Units 
MOTORHEAD - One Hit Kills 
BICYCLEREPAIRMAN - Free Repair 
SPOTTHEBRAINCELL - Add 1000 XP to Unit 
MONEYSONG - Add 1000 Prestige to Unit 
DIRTYHUNGARIANPHRASEBOOK - Win Mission 
MRHILTER - Call for Support 
THEFUNNIESTJOKEINTHEWORLD - Unknown Effect 
FREEWESTMEMPHIS3 - Godmode 
THESPANISHINQUISITION - Instant kill