Custom Minesweeper
Make your own board. Set the width, the height and the number of mines above the game, then press Play. Anything from a quick 5 × 5 to a huge 100 × 100 works.
Your last size is remembered, and the page address keeps it too, so you can bookmark a favourite board or send it to a friend.
Quick picks
Tap one to load it straight into the game.
| Board | Size | Mines | Mine density |
|---|---|---|---|
| Small | 10 × 8 | 10 | 13% |
| Medium | 18 × 14 | 40 | 16% |
| Large | 24 × 20 | 99 | 21% |
| Wide | 50 × 25 | 250 | 20% |
| Huge | 100 × 100 | 2,000 | 20% |
Choosing the number of mines
The size of the board matters less than how crowded it is. Mine density is the share of squares that hide a mine, and it changes how the game feels more than anything else.
- Around 10 to 12%. Relaxed. Big openings, few guesses. Beginner is 12%.
- Around 15 to 16%. The classic feel. Intermediate is 16%, and most boards can be cleared by logic.
- Around 20%. Hard. Expert is 21%, and many boards need a guess somewhere.
- 25% and up. Very hard. Openings are rare and numbers run high. Master is 28%.
A quick way to pick: multiply the number of squares by the density you want. A 40 × 30 board has 1,200 squares, so 15% is 180 mines.
Playing big boards
- Boards too big for your screen scroll inside the frame. Full screen gives you the most room.
- Wide boards turn sideways on a phone held upright, so you get bigger squares.
- Chording saves a huge number of clicks. When a number has all its flags, click the number to open the rest of its neighbours.
- Work in one area at a time. On a 100 × 100 board it's easy to lose track of which edges you've already checked.
New to the game? Start with the how to play guide, then the patterns that come up on every board.
Other boards
Questions people ask
What is the biggest custom board?
100 by 100, which is 10,000 squares. The smallest is 5 by 5.
How many mines can I add?
Up to the number of squares minus nine, so there is always room for a safe first click and the eight squares around it. If you type a number outside the limits, the game picks the nearest one that fits.
Is the first click safe on custom boards?
Yes. Just like the standard levels, the mines are placed after your first click, and the square you click plus the eight around it are kept clear.
Are best times kept for custom boards?
Yes, separately for each size and mine count, in your browser. Open Settings to see your record for the board you are playing.
Can I share a custom board?
Yes. The page address changes to include the size, for example /custom-minesweeper?w=30&h=20&m=120. Anyone who opens that link gets the same size and mine count, though with their own random board.
Is there a no guess option for custom boards?
Not yet. Checking very large or crowded boards for a guess-free solution can take a long time. For boards you can always clear by logic, play No guess mode in the Beginner, Intermediate or Expert size.
