A rectangular board is generated, with mines spread out on it randomly. You know how much mines there are, but don't know where they are.
Left-click any of the cells - your first click is guarranteed to be safe, on top of that, it will always open a "zero" in this minesweeper clone.
Opening a cell without a mine will show you a number, denoting the total amount of mines around this cell.
No number = 0, and it opens all cells around it (often triggering a chain reaction).
Right click a cell to "flag" it, to mark it as a mine, that way you won't accidentally open that cell, if you click it. Right-click a flagged cell to unflag it.
Using logical deduction, open every safe cell without opening a cell with a mine.

e.g., If a cell with a 1 has only one unopen cell near it, that cell has to be a mine - you can flag it.
If a cell with a 2 already has two (correct!) flags around it, all unflagged cells near it are safe
- you can l-click or r-click the cell to "chord" it, opening all unflagged cells near it.
(Watch out, though, as you may open a mine this way.)

You can read about some strategies and patterns on minesweeper.online.

Fun fact: on this minesweeper clone, you can chord an overloaded cell (one that has too many flags), opening all unflagged cells near.
So, albeit forced, it's possible to play it with only RBM.

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