Getting the "Cematary" key:

• After opening the gate to the street with three houses, enter the basement of the left most house.
  
• The basement is graphically broken but it is still possible to beat despite half the walls not rendering properly.
  
• Run straight ahead and you will encounter some pipes attached to invisible walls. Further ahead you will see coridor that is actually visible; go right and through the door.
  
• This part of the basement isn't hilariously broken, continue ahead and find a Hammer inside a locker (the Cassette tape on top of the hammer is useless but you can pick it up if you wish).
  
• Now make your way out of the basement and go to the top floor, and enter the apartment there.
  
• Pick up the penknife, enter the diningroom and smash the statue with the hammer, to get the bent "Cematary" key.
  
• Enter the apartment on the ground floor, enter the bedroom (door on the left at the end of the hall), use the penknife on the painting of Jesus and pick up the Locker key.
  
• Go back inside the basement but this time, when you reach the visible coridor, turn left instead and use the Locker key on the locked locker to get a Pair of tongs. This is the bit that was broken, since the locker key was spelled incorrectly in the map script.
  
• Use the Pair of tongs on the "Cematary" key to bend it straight. You can now enter the "Cematary".
  

Tool location:

• The other walkthrough gives you a hint on where to find this tool, but since I had way too many issues with finding it I will write down the exact location here.
  
• From the same street as before with three houses go in between the two left most houses and keep turning left until you reach a dead end with a bunch of trash cans in it. The tool is in the right most trash can.
  

Opening the door to the otherside:

• The other walkthrough will get you most of the way but once you get the four-digit code use it to open the locker outside the chemistry room. This will give you two more chemical jars.
  
• Now you have to combine the chemical ingredients in the correct order. If you get it wrong you can use the matches to start over. If you want you can figure it out on your own, the note gives you enough hints but if you just want to get it over with, the correct order is cloride, salt, iron, matches.
  
• After you've made the correct mixture use it on the door at the bottom of the stairs, and enjoy your stay in hell.
  

The otherside key code:

• Inside the third area in the otherside. This is completely optional and is only here for completeness sake. I have no clue how you are supposed to figure this out, perhaps something to do with the plaques in the first area, but the solution is 0264.