What if you could guarantee a safe first click in Minesweeper — every single time? No guessing, no luck. Just a tiny script that takes over the browser’s random number generator and stacks the deck in your favour.

What is Minesweeper Online?

Minesweeper Online is a faithful browser recreation of the classic Windows game. The board hides a fixed number of mines; reveal a mine and it’s game over. Reveal every safe cell and you win.

Every game starts fresh — a brand-new random layout of mines, decided the moment you click the very first cell.

That last part is the key.

How Mines Are Actually Placed

Minesweeper Online uses JavaScript’s built-in Math.random() to decide where the mines go. When you click the first cell, the game calls Math.random() repeatedly to pick random coordinates for each mine, making sure none of them land on the cell you just clicked (so your opening move is always safe).

Math.random() returns a floating-point number between 0 (inclusive) and 1 (exclusive). Those numbers are then scaled to fit the board dimensions to produce row and column indices.

Because Math.random() is just a regular function sitting on a global JavaScript object, we can replace it with our own version — before the game ever calls it.

The Hack: A Fake RNG

Our replacement Math.random() is about as simple as it gets:

let fakeRandom = 0;

Math.random = function() {
    fakeRandom += 0.000001;
    if (fakeRandom >= 1) fakeRandom = 0;
    return fakeRandom;
};

Instead of unpredictable numbers, it returns a perfectly predictable, ever-increasing sequence: 0.000001, 0.000002, 0.000003, …

When the game scales these near-zero values to board coordinates, every mine lands in the top-left corner of the board. The rest of the board — and in particular the bottom-right corner — stays completely mine-free.

So the strategy becomes:

1. Inject the fake RNG.
2. Start a new game (click the smiley face ☺ to reset).
3. Click anywhere in the bottom-right corner to make your first move.
4. The game will cascade open from there, giving you a massive head start on a board where all the mines are conveniently bunched in the opposite corner.

Desktop Method: The Browser Console

This method works on any desktop or laptop browser.

Step 1: Open Minesweeper Online

Go to minesweeperonline.com and let the page fully load.

Step 2: Open the Browser Console

Direct shortcut: Ctrl + Shift + J (Windows/Linux) or Cmd + Option + J (Mac) jumps straight to the Console.

Step 3: Paste and Run the Script

Copy the script below, paste it into the Console, and press Enter:

(function() {
    let fakeRandom = 0;

    // Overwrite the browser's native random number generator
    Math.random = function() {
        // Increment by a tiny amount so it generates sequential coordinates
        fakeRandom += 0.000001;

        // Loop back to 0 before it hits 1 to prevent array out-of-bounds errors
        if (fakeRandom >= 1) fakeRandom = 0;

        return fakeRandom;
    };

    alert("RNG Hijacked! Click the Smiley Face to start a new game, then click the bottom-right corner.");
})();

You’ll see an alert: “RNG Hijacked! Click the Smiley Face to start a new game, then click the bottom-right corner.”

Step 4: Start a New Game

Click the smiley face ☺ button at the top of the board. This resets the game without refreshing the page, so our fake RNG stays in place.

Step 5: Click the Bottom-Right Corner

Click any cell near the bottom-right corner of the board. Because all mines are now clustered in the top-left, this region is entirely safe. The game will cascade open, clearing a huge chunk of the board instantly.

Mobile Method: Bookmarklet

Mobile browsers don’t have a developer console — but they do support bookmarklets. A bookmarklet is a bookmark that runs JavaScript instead of navigating to a URL.

Step 1: Create a New Bookmark

In your mobile browser, bookmark any page. The URL doesn’t matter — you’ll replace it in the next step.

Step 2: Edit the Bookmark

Open your browser’s bookmark manager and edit the bookmark you just created:

• Change the name to something like Minesweeper Hack
• Replace the entire URL with the code below (copy the whole thing — it must be one continuous line):

javascript:(function(){let fakeRandom=0;Math.random=function(){fakeRandom+=0.000001;if(fakeRandom>=1)fakeRandom=0;return fakeRandom;};alert("RNG Hijacked! Click the Smiley Face to start a new game, then click the bottom-right corner.");})();

Save the bookmark.

Step 3: Run It on Minesweeper Online

1. Go to minesweeperonline.com and wait for the page to fully load.
2. Tap the address bar, type Minesweeper Hack, and when the bookmark appears in the dropdown, tap it.
3. An alert will pop up confirming the RNG is hijacked — tap OK.
4. Tap the smiley face ☺ to start a new game.
5. Tap anywhere near the bottom-right corner of the board.

Under the Hood

Why Replacing Math.random() Works

In JavaScript, Math is just a plain object, and Math.random is just a property on it — a regular function reference. There’s nothing preventing you from assigning a different function to Math.random. As far as the page is concerned, it’s calling the standard API; it has no way to tell the difference.

This is one of JavaScript’s most powerful (and occasionally dangerous) features: the ability to monkey-patch built-in globals at runtime.

Why Start a New Game After Injecting?

The fake RNG needs to be in place before the game places the mines. Mines are placed when you click the first cell of each game — not when the page loads. So by starting a fresh game after injecting, we guarantee that Math.random() is already hijacked when the mine-placement code runs.

If you skip the reset step and click immediately, the mines from the previous game (placed with the real RNG) are still on the board.

Why the Bottom-Right Corner?

The fake RNG starts at 0.000001 and increases in tiny steps. When the game converts these values to coordinates, the smallest values map to the smallest row and column indices — i.e., the top-left of the board. So the top-left corner is where all the mines pile up, and the bottom-right corner is the furthest point from the danger zone.

The >= 1 Guard

Without the if (fakeRandom >= 1) fakeRandom = 0 line, the counter would eventually reach 1.0. Since Math.random() is defined to return values strictly less than 1, returning exactly 1 could cause the game’s array index calculations to go out of bounds. The guard keeps our fake values safely in the valid [0, 1) range.

Now go enjoy your (totally legitimate) winning streak! 🏆

Enjoyed this? Check out Hacking the Chrome Dino Game, Hacking TypeRacer, or Hacking Wordle for more fun browser tricks.