Minesweeper rules
- Open every square that has no mine. Your first tap is always safe.
- A number counts the mines in the eight squares around it, corners included.
- Flag a square you know is a mine: long-press it, or right-click.
Every board here can be cleared without a guess.
How to solve it
The count
A number with all its mines flagged: its other neighbours are safe. A number with as many closed neighbours as mines to find: they are all mines.
The 1-1 and 1-2
A 1 whose closed squares all touch a 2: the 2's other mine is in the squares only the 2 touches. A 1 beside a 1 on a wall works the same way, with no mine left over.
The total
Near the end, count the mines left. None left: every closed square is safe.