A version of minesweeper I used to play was called stormsweeper. I think it was written in BBC Basic and ran on RISC OS. Instead of flagging mines, you got to r

A version of minesweeper I used to play was called stormsweeper. I think it was written in BBC Basic and ran on RISC OS. Instead of flagging mines, you got to remove them, and the numbers of the already revealed squares were updated. Every few seconds (time depended on what level you were playing) all the numbers were covered back over and all the remaining mines moved up to one square each. Blank squares stayed blank, and they were safe to click on as a mine could not move 2 squares. Once you had cleared a bit of the screen, if you then got stuck, you could wait for the next storm then some of the mines would likely have moved to a solvable position.