Most difficult levels in existence?

[M11k4]

Traps under locks should not appear much in the future, since it's not lynx-compatible. I made a whole level of keys under doors called Key Hell -- one of the worst levels I ever made.

Dave, it's also one of your most memorable and one of my favorites! I solved it blind and then optimized it using a map, and enjoyed it very much. It's a concept that really can't work without invalid tiles, the maze has several solutions, and not every lock is guesswork (though many are, but they aren't surprising cooks, since you know you have to guess correctly or it's cooked).

-Miika