This is practically the easiest way to kill a dongo. What you do is you get behind it somehow and anchor onto it's thermal energy gland. Once you are on it... Just pull the trigger. Wayne will automatically shoot the gland and it will die in a couple of seconds.
Ok go to level 3 when you get to the open area go to the left. When you get to the end of the clif along it without going to the open area. Sooner or later you will eathir fall or see a big snake which ever keep walking and DONT SHOOT it because you will need the amo later. When you get to the wall of snow at the you turn right and see a buliding but don't go to it insted go on or next to the wall until the next wall and walk on that on until you are a good distance to run to it without get killed.
P.S. Don't kill the flying aliens because they don't kill at all P.S.S. There will be heat on the way there get it
When you start the game, after a few minutes, you will fight Green Eye. Dont expect to win. The beast is programmed not to die, so you will be beaten. Therefore, cheating here would completely ruin your game because you would never die.