Everyone who claims to have beaten it is either a liar or a cheater. The liars are the ones who played modifyed versions which removed the blind maze/made that guessing game less evil. It's only QoB if you play the original version.

The cheaters are the ones who just used cheats to pass the level, or looked at it in JCS as a sort of "map".

The fact that QoB has a ridiculous blind maze and a guessing game makes it a poor level by most standards. All it has going for it is that it is big. Even the puzzles don't amount to anything more than boring maze crawling.