Find the going too tough?
You can always cheat by pressing the HAC keys simultaneously at any time during gameplay to give yourself full health and add a nice boost to your ammo supplies (but you'll lose the added carrying capacity of a backpack if you have one). However, should you take this cowardly option, your score will be reset to zero, and will remain at zero for the remainder of your game. The lesson here is that cheaters never prosper! In other words, if you're chasing a high score, don't cheat! Loading a previously saved game (one saved before you applied the cheat), or starting a new game, will restore your scoring ability.