Hi, Tobias! I've renamed your puzzle TF1. Only I get to create puzzles named solely by natural numbers. This is not because I'm dictatorial - it's because for a while people started creating puzzles that I didn't notice, and the numbering scheme became confused!

I am very happy you're here. I really think it's great that people are not only solving puzzles, but posing their own. People can learn a lot in a "teaching/learning ecosystem" like this.