1. IF YOU'RE FIGHTING A LARGE AMOUNT OF GUARDS, STRAFE FROM SIDE TO SIDE WHEN YOU SHOOT. THIS WILL MAKE IT HARD FOR THE GUARDS TO SHOOT YOU. YOU CAN STRAFE BY SIMULTANEOUSLY PRESSING THE RIGHT SHIFT KEY AND EITHER OF THE LEFT AND RIGHT MOTION BUTTONS.
2. ON LEVEL 9, ON THE LEFT SIDE THERE IS A SECRET DOOR WITH A REITHE ON IT. THE SECRET ROOM WILL GIVE YOU EVERYTHING NECESSARY TO KILL THE BOSS. WHEN YOU OPEN THE DOOR WITH THE BOSS BEHIND IT, MOVE BACK ABOUT HALF WAY. AS YOU SHOOT AT THE BOSS, MOVE FORWARD AND BACKWARD EVERY FEW SECONDS. THIS TECHNIQUE HAS WORKED FOR ME, I MANAGED TO KILL THE BOSS AND STILL HAVE 100% HEALTH; I DIDN'T EVEN USE ANY OF THE CODES I SHOWED IN THE CHEATS SECTION!
IF YOU HAVE A HINT OR STRATEGY THAT YOU WOULD LIKE TO SUBMIT THEN PLEASE EMAIL IT TO ME WITH THE SUBJECT "HINT" (WITHOUT THE QUOTES) ALONG WITH YOUR NAME. AND I WILL GLADLY PLACE IT UP HERE.