Since I've been trying to beat all difficulties and subdivision of the Half-Truncated Truncated Icosahredon, I have had to do many attempts to beat some of them.
Just now I beat it on Insane difficulty, subdivision 4.
I had been trying to do that for almost 2 months now, getting within a few mines left before I had to guess and guessed wrong.
Does anyone else ever spent weeks or months attempting to beat a single board?
If you only have a few mines left, here's a tip. You can solve the board by either uncovering all the safe tiles, OR by flagging all the mines. So at the end, rather than guessing which tile to reveal, try flagging the different possible combinations of mines until you get it.
Don't you mean "expert"? I have been working on "insane" for awhile and finally broke through and beat your time! It appears that you beat my time on "expert" on the same day - how crazy is that! I was surprised that my number of records didn't go up when I submitted it B^)