I'm not 100% certain of my best all time scores because whenever I
re-install windoze, it overwrites my old high scores, but here are
guesses and current known best times:
Beginner: 6 seconds. Current best: 7 seconds.
Intermediate: ~40 seconds. Current best: 44 seconds.
Expert: 120 seconds!
If you have beaten any of my best times, I would be interested in hearing from you. See my e-mail address at the end of this page.
However, you should't waste your time marking mines that won't help you.
If you have a square with a number n in it, and you've marked n mines next to it, click both buttons on the square with the number on it to clear all other squares next to it. If you have a 3 button mouse, you can hit the middle button and it will also work.
and Beginners should make extensive use of the "?" markers (by right clicking twice) to help figure out the different possibilities.
Experts should turn off use of the "?" because it takes too much time to use the and even if you don't want to use them, it will take you two clicks (instead of one) to correct any incorrect mine markers.
The first square you click will never be a mine. If there is one there, it will be moved. If the first square you click is the top-left corner, then the mine will be moved to the square to the right. If it is already occupied, it will be moved directly below it, or diagonal (down and right). I haven't figured out how it behaves in other situations. If you do click on the upper-left corner first and it has one mine next to it, there is a 50% chance it is on the right. If there are two mines next to it, there is a a 83% chance that the square on the right is a mine. This knowledge can be helpful when trying to make a last-ditch guess.
Another strategy for guessing is to guess a square about which you have no knowledge, but which is next to places that might be mines. These have a 80-85% chance of being empty, and they might give you some helpful information.
Mark ALL of the mines. It sometimes ends up that you have to finish by using the number of mines that are left. It's annoying ot have to look around to see which mines you didn't mark.
If you find a place where you know you will have to make a guess, do it then (rather than waiting). You're chances won't be any better, and if you make the wrong guess clearing the rest of the field won't do you any good.
Don't get discouraged if you lose a lot. You're chance of winning (even without making mistakes) isn't that great.
A list of people who have put me to shame. :(