As I mostly use a 0.5mm nozzle the design was made having that in mind.
However (and thanks to arachne) it is also printable with a 0.4mm nozzle.
I do have all extrusion widths set to 0 in prusa slicer and could easily print on both my printers.

Basic Print Settings:

• Layer height: 0.25mm
• Supports: none
• Vertical shells: 3-4
• Horizontal shells: 4-6
• Infill: should not matter - 10-20%
   

Also i wanted to have a nicer look and therefore created field markings.
The way to print is:

1. Print the File: MasterMind_Markierungen first and leave them on the bed
2. Remove (if you have used) any skirts around the print.
3. Enable “Lift Z” and set it to 0.6mm (the markings are 0.5mm high)
4. Print the Field (MaterMind_Spielfeld) on top of the existing print.

If you don't want to do that you can just import both Files and print them as one object in one color. Just mark both files after adding, right kick → merge.