I played level 70 for days/weeks with two personas and finally got the 'luckof the draw' and fast, fast mousing to finish. Now, I have been stuck on 75 for about a week with both personas! Sometimes it just seems to take time and building $$ to pass a level. I see hope on the horizon, but see folks stuck at 90, 98, etc.! Lots of fun playing and glad the McA 'bugfix' didn't steal all my results.
Meanwhile, I have found I get more done if I start clearing off items with bombs and such about 1/3 through - at least I get all the chests needed and am closing in to the completion of the clearing of all spaces!