Use arrow keys to move around.
Press Q to reveal square. If it's a mine, it's game over.
If no mine is revealed, a digit is instead displayed in the square, indicating how many adjacent squares contain mines; if no mines are adjacent, the square becomes blank, and all adjacent squares will be recursively revealed.
Press W to set flag (or remove).
You need to flag all the mines correctly to win.
Press 1, 2 or 3 to start a new game (with increasing difficulty).
The game was released last year in cartridge format for the 1981 TI-99/4A Home Computer.