About

This is OneMillionMines.com, the first-ever online-multiplayer Minesweeper grid containing 1 million mines.

How to play

One million mines have been placed randomly in a grid. The game starts with most cells (or "squares") covered, so you don't know where they are ! Your mission is to mark squares containing a mine with a flag and open empty squares. An opened empty square will display the number of mines in adjacent squares, making it a game of pure logic and deduction rather than chance. The game ends when all empty squares have been opened.

You may interact with the game in the following ways:

set or unset ("toggle") a flag on a covered square
open a covered square that is not marked with a flag
open adjacent squares of an empty opened square
jump somewhere else in the grid using the jump button 🎲

Note that the "open adjacent squares" action will only work if the number of flags in the adjacent squares matches the number displayed in the target empty square.

Opening a square containing a mine will kill you.
Well, not in the actual sense of the term.
But you will be prevented from playing for a small period of time, ranging from 10 seconds to 15 minutes; just to teach you a lesson.

Playing on a computer

The mouse controls are:

right-button click: toggle the flag marker on a covered square
middle-button click: open adjacent squares
left-button click: open a covered square, or (when clicking on an empty square) open adjacent squares
mouse wheel: zoom in or out
left-button: hold the button down and move the mouse to move on the grid

Playing on smartphone

(hopefully it works)

tap on a covered square: toggle the flag marker
tap on an empty square: open adjacent squares
long-press on a covered square: open the square
move and zoom on the grid by doing the standard "gestures" (a.k.a. pan & pinch)

Changelog

v1.0: initial release.

Reporting bugs & requesting new features

You may report bugs or suggest new features in the project bug tracker on GitHub.

Cookies & Privacy

We don't use cookies, we eat them.

Your position on the grid is saved in the URL's fragment (the part of the URL after the "#" sign).
Your zoom-level is stored locally and is likely to be lost when the cache is cleared (for example, when closing your browser).

No personal information is collected.

Credits and third-party usage notice

Client-side game logic and communication with the server is mostly implemented in C++ (and compiled to WebAssembly using the emscripten toolchain).

Grid generation is heavily inspired by the "Mines" game from Simon Tatham's Portable Puzzle Collection (MIT-licensed).
The grid generator, and most specifically the solver, was basically rewritten from scratch (and from C to C++) to support generation of 1-million-mine grids.