By the way, I never figured it out, what the heck is the purpose of marking squares in minesweeper?

Also, the Windows version allows you to click both mouse buttons. If you've marked enough mines around the square you've clicked on, it'll clear the other surrounding squares in one go.

I usually play by: right-click, right-click, both-click, right-click...

And I finished Easy in 3 seconds once. Two clicks.