The maze is the same no matter the keys. But yeah, it's not too fun of a concept for sure as it's basically just trial and error with a bit of a memory requirement. And from that description yeah, seems like you managed to break something. Just incrementing the level shouldn't be enough but maybe in conjunction with something else you did or something. Cause it seems like quite a few of the games weren't working 100% correctly. Like I guess Germany was the solution of a round but the keys didn't get reset properly for some reason.
playing through again to check out what i missed and had the same issue with the questions... maybe it's a joke i'm not getting. but i did see a few new games I had missed! maybe my fiddling messed up more than I thought! now I'm stuck at the "related keys" puzzle, can't seem to figure out how to end it...