For saving the last human:
First click on the door.
then click on de paper then on the wc and then you flush the toilet.
then you click on the bad. after that you click on the sink. then on the closet. then you click on the hairdryer then you put the hairdryer in the electrick thing. then you put the hairdryer in the sink then you click again on the closet. then you take the gun and you hit en smash the parasite. you can also put the dryer in bad. then de parasite wil toast.
A tip for everyone if you see a zombie with a shotgun or a oder weapon search then for weapons 100% you will find something. and if you see a cop or a swat guy also look for weapons!