just keep in mind that the more frustrated you are throughout the challenge, the more relieved you'll be to finish it.
unless of course, you're stubborn, tired, angry, and decide to give up and never end up finishing.
no, i'm not talking about anyone specifically, there were many people today who felt that level 6 wasn't a proper challenge.
level 6 is more like a test of patience; if you don't have the time, then i guess you shouldn't play the level. pretty much everyone who got to level 6 today and didn't finish it left thinking
"what kind of challenge is it to make me look for 2 doors out of 63?"
but that isn't true, not at all. i, and others, were able to knock down 63 doors to around 20 just by looking at the position of the houses and eliminating the choices that seemed unreasonable.
the most likely to not have a key in it (the second house, the first black house, the corner grey houses, etc.)