This time, I found a level, which had been too easy. I accidentally left the exit "on" by default, which made completing "Cathedral" way too easy. Now, you'll have to work just a little harder to complete it...
But hey -- where would be the fun otherwise?
(Oh, and in case you're still wondering: Last time, I messed up "Core" -- I lost two stones, so that level became unsolvable).
Have fun!