Unlock Levels
Type in CAMPAIGN in the main menu.
Save Game More Than Once
While playing press [Al[Tab] to switch to Desktop and then go into the "Userdein_nahmesave" subdir of the game install dir. In one of the subdirs you'll find save.fps file. Delete it, press [Al[Tab] to switch to game and you'll be able to use the save function again!
More tricks, tips and cheats for this game are right here - Operation Flashpoint: Dragon Rising cheats
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