Obviously there are some codes that do not need a cheats enabler to be
 activated. Open the console by pressing the [~] key, type in the code and
 conform with [Enter].

 god_mode_count=1               Invulnerability
 give_all_weapons=1             All weapons
 give_all_ammo=1                Ammo full
 map x                          Jump to level x where x might be:
                                archive
                                boat
                                bunker
                                carrier
                                catacombs
                                control
                                cooler
                                dam
                                factory
                                fort
                                pier
                                rebellion
                                regulator
                                research
                                river
                                steam
                                swamp
                                training
                                treehouse
                                volcano
 load_game <name>               Quick load
 save_game <name>               Quick save