With one big lock I wonder how tempting it really is to replace a lock as soon as few people solve it, for me I've been doing it mostly because the solutions you guys came up with were easier than the one I used to solve it, so assuming I had 1 big lock I don't see why I'd be too quick to replace it assuming it works as I expect it to. But if having just 1 lock isn't good you could just have 2 large locks.
Have you considered something like giving more lock slots the more notes you have(And a limit to amount of notes you can put behind a lock)? It might give me reason to solve locks other than esteem and just for the sake of it. But hmm having some people with tons of locks might seem a bit intimidating to people and stuff which is why a tiered access to bigger/harder locks would keep things more simple.
Anyway I kind of wish there was some way to get more lock slots if you solve or make enough locks or something. I like that at first you have only 3 locks to worry about but once I've done the 3 locks and have some notes behind all of them I might want to do more locks so should I then just randomly replace one of my existing locks or make a another account? Having 1 or 2 big locks that most won't even get to try(or even see) without solving the smaller ones would give me a lot more to do if I want to without really affecting the current system.
Maybe you should add some small limit to how often you can retire a lock. Something like if lock has been solved you can't retire until a day has passed since someone first solved it.
By the way, I've not tried the new NOI:B yet but NOI:C was a nice lock and took some solving.
Nice, your solution was a little different than I was expecting but close enough that I don't really feel the need to prevent doing it the way you did it right away(I could just make the top of the center part flat so you can't move it to right with the hook).
And I see you solved B just now, you did it exactly as I wanted it to be done!
Now I just need to solve some locks to add notes behind it.
I also tried to do ZED:C for a while and managed to get the hook and/or ball to the top left area without making the opening I assume is necessary close but couldn't figure out what to do next