May 21st has a bug that if you have 2 tiles remaining, 1 mine and 1 safe, if you click the mine, the game thinks you won, and you complete the level. (does not work for 9)
that's actually been a bug that's been present in all the versions, i think.
This is because the game counts these 2 tiles as a "guranteed win" thinking all tiles are numbers.
