"Get Trust Meter Up
you can either use a blood test or give you team mate a weapon and ammo to get your trust level up to 100%" - Aaron

"use stun grenades on walkers and mutants, then blowtorch them or use fragment grenades.  extra tip: use a flame thrower and mp5 on scuttler hordes that are advancing on you or your team." - ???

"whenever you are using flame-thrower or blow-torch try to use them in crouch position. In crouch position flames go directly to the target and they will not burn your feet, especially in the case of flame-thrower." - sunny

"WHEN A BIG THING COMES TO ATTACK YOU JUST USE YOUR FLAMETHROWER TO CREATE A BARRICADE OF FIRE BETWEEN YOU AND IT. THE THIG WILL NOT ADVANCE GIVING YOU TIME TO SHOOT IT AND DECEASE IT'S HEALTH. IF THE FLAME DIES JUST USE THE FLAMETHROWER AGAIN. IF THE RETICLE BECOMES RED GIVING YOU INDICATION THAT THE THING IS WEAK THEN FLAME IT (TWICE) AND YOU ARE DONE!" - gabrus666

"KEEP NOBBING REGULAR GRENADES AND IF YOU HAVE TO, SWITCH TO HIGH EXPLOSIVE GRENADES. YOU DON'T EVEN HAVE TO COME NEXT TO HIM!!!BUT ALWAYS REMEMBER TO FINISH HIM OFF WITH FLAME GRENADES." - SMART GAMER AF

"On the level with sectors to open.When you press the wrong button the alarm goes off.If you did it right the laser door will open.When u do it wrong the soldiers go after u.The order for the buttons is (stand infront of them) 1,4 then wait." - V Man