The hardest- the gazogem refinery
The gazogem refinery is maybe the hardest part of the game. There is four rooms in this refinery and the second is the hardest. To get there you must, when you´ve found the Burgermaster´s treasure jump onto the pipes next to the fence and then jump over the fence. Go into the first building and you are in the gazogem refinery. When you switch the wheels you close or turn on the gasshooting things. The first room is the easiest, just go straight over the gasshooters and take the key to get to the hardest room. (I got stuck in more than 3 hours in that room) Go up with the elevator. (the square next to the wall with the blue lines) Then run and jump from the square next to the elevator and you´ll land between the gas basin. Then you have to go past the fence and then take the key in the red box. Go past the next door and you´re in the third room. Go over the gasshooters until you get to the elevator that´ll take you to the next door. (remember to take the key) Here you´ve got to use ACTION in discreet mode to continue. Now you are in the last room. Go to the empty gasshooter at one side of the little stairs. Throw the ball at the scienist until he dies. Go into the dogs´ garden and kill them or just don´t care. Go to the gazogem and collect and take the key in the red box. Now go out. Jump on the barells to continue over the fence again.
CONGRATULATIONS! YOU HAVE COMPLETED THE GAZOGEM REFINERY!!!