I have a diploma in mathematics (in Galois theory). Now I try to do some hobby research if I have time.

So you like visual and original logic-puzzles?

Try my website:

• https://www.keli-puzzle.de
• https://www.keli-puzzle.de/balance.html
• https://www.keli-puzzle.de/boja_11_5_2.html
• https://www.keli-puzzle.de/halloween.html