Minesweeper + Tetris = TETRiSweeper. I had assumed this would be novel, but not particularly engaging. Or engaging, but not particularly engrossing. It looks like I was wrong.
Click to reveal a square. Shift-click to flag a square as unsafe. WASD to control the falling Tetris pieces as they add themselves to the Minesweeper board. The only way to clear a row is to reveal/flag all of that row's squares, assuming you didn't mess up your Tetris stacking and leave the row unfinished to begin with. The game ends when you accidentally uncover a mine or allow the Tetris pieces to reach the top.
The rules leave open a whole bunch of different strategies to discover, many of which are limited by your ability to pay attention to multiple parts of the board simultaneously.
My high score thus far is 19,255 in Original mode, Normal difficulty. I haven’t tried the other variations.