Thanks for your feedback! Fair points :) I was a bit afraid hiding info inside of text would make people miss it, but perhaps I could've done something inbetween.
I used numbers for variables as I thought that'd be the easiest to convey, also to non-programmers, how to make the statements correct. I'm not sure how I feel about making it a quiz :p it somewhat makes sense if its a security question, but it feels less like fixing a set of bugs.
Anyway thanks a lot ^^ good to know what you think