Walkthrough of Matze's Great Scavenger Hunt

Step 7 (Final Step)

Okay, this one isn't exactly one you can do just anywhere, either. Especially not while sitting motionless in front of your computer.
In fact, this step consists of a treasure map, which gives you some directions that you have to follow in our flat. Much like treasure maps in Pirate movies.
You know, like "From the dead tree with the three branches, turn north and walk 50 steps. Then, turn right and kill yourself".

Anyway, the first set of directions is hidden behind the sign on the door leading to Roman's room.

This is the back side of the sign:

And this is a scan of the directions:

If you follow the directions you were given, you should end up in front of the heater in our kitchen:

Looking under it will make you see that there is another set of directions

This is the scan of the second set:

Again, if you follow the directions, you should end up in front of a table in the living room.

When you have a look under the table, you should find the last set of directions:

The scan:

So after following this last set of instructions, you should end up in front of Mathias' mattress.

And a look under it reveals the last part of the Scavenger Hunt:

Here's the last Code, though you will have to find out the right password yourself, according to the last hint;)