This is a puzzle of a game where I know the solution, but not how it is derived. So the correct answer goes to whoever can also explain the solution.
Find the correct code:
This is written on top of a closed door:
And this is a number on the closed door: 13
On the floor the following table can be found:
A | + | 2 --+---+--- - | 3 | - --+---+--- 8 | + | D
You have to find the correct 4 digit code.
Since nobody found the solution after a week, I'm now adding a part of the correct answer as hint. If this doesn't help, I'll add the complete solution in another week.
The middle part of the code contains the 13: so A13D
A and D are replaced by single digits. But which?