About

Minesweeper.org is a free online minesweeper game built for players of all skill levels. Whether you're a first-time player learning the basics or a seasoned speedrunner chasing leaderboard times, this site offers classic gameplay alongside modern features like real-time multiplayer duels, daily quests, and puzzle variants you won't find anywhere else.

The site is built and maintained by Richard Cross, founder of Regis Consulting, a software consultancy specializing in web development. Minesweeper.org is built from scratch using Python, FastAPI, and modern web technologies — no templates, no clones. Every game mode, every feature, and every line of code is original work.

What Makes This Site Different

Minesweeper.org goes well beyond the classic Windows game. Here's what sets it apart:

  • No-guess mode: Every puzzle generated on this site is logically solvable. You'll never have to make a 50/50 guess to win — every move can be deduced through logic alone.
  • Multiple difficulty levels: Choose from Beginner (10×10, 10 mines), Intermediate (16×16, 40 mines), and Expert (30×16, 99 mines), or create a custom board with your own dimensions and mine count.
  • Multiplayer modes: Challenge other players in real-time Duels and PvP matches. Race to clear your board before your opponent clears theirs.
  • Rush mode: A fast-paced, timed challenge designed to test your speed and pattern recognition under pressure.
  • Tentaizu: A minesweeper-inspired logic puzzle where you must locate hidden stars using numeric clues — no clicking to reveal, just pure deduction.
  • Variants: Alternative rulesets and board shapes that put a twist on the classic formula.
  • Daily quests: Fresh challenges every day to keep the game interesting and give you new goals to work toward.
  • Global leaderboard: Compete for the fastest times. Scores reset daily at midnight UTC, so there's always a new chance to claim the top spot.
  • Multilingual support: The site is available in English, Esperanto, German, Spanish, Thai, Portuguese, Ukrainian, and French.

Why is Minesweeper Interesting?

  • Minesweeper is NP-complete — meaning it belongs to the same class of computational problems as the traveling salesman problem and many other famously hard puzzles.
  • The 2025 World Championships finished in September in Madrid. Xian-Yao Zhang (stan kimi) won the championship.

A Tribute to Diana, Princess of Wales

This site is dedicated to Diana, Princess of Wales, and her tireless work to ban landmines around the world.

In January 1997, Diana walked through an active minefield in Huambo, Angola, wearing protective gear provided by The HALO Trust. The photographs from that visit became some of the most iconic images of her humanitarian work, and they brought the devastating reality of landmines into living rooms across the globe. At the time, landmines were killing or maiming an estimated 26,000 people every year — the vast majority of them civilians, many of them children.

Diana's advocacy was not without controversy. Some politicians accused her of meddling in political affairs, but she pressed on. She visited mine-clearance operations in Bosnia just weeks before her death in August 1997. Her efforts helped build the political momentum that led to the Ottawa Treaty (the Mine Ban Treaty), which was signed by 122 nations in December 1997 and has since grown to over 160 signatories. The International Campaign to Ban Landmines was awarded the Nobel Peace Prize that same year.

Despite this progress, the work is far from over. The United States, Russia, and China are among the nations that have still not signed the Ottawa Treaty. Landmines and unexploded ordnance continue to kill and injure thousands of people annually in countries across Africa, Asia, and the Middle East. Each game you play on this site is a small reminder that while minesweeper is a game for us, for millions of people around the world, mines are still a daily reality.

Diana's wish that all landmines be banned in her lifetime did not come true, but you can help make it come true in yours.

Support the Cause

If you'd like to support landmine clearance efforts, consider learning more about or donating to these organizations:

  • The HALO Trust — The world's largest humanitarian mine clearance organization. HALO has destroyed over 3.2 million landmines and other explosive remnants of war across 30 countries and territories. Diana worked directly with HALO during her visit to Angola.
  • International Campaign to Ban Landmines (ICBL) — The Nobel Peace Prize–winning coalition that advocates for a total ban on anti-personnel mines and works to support survivors.
  • Mines Advisory Group (MAG) — A humanitarian organization that clears landmines, cluster munitions, and unexploded bombs from communities affected by conflict.

About the Developer

Minesweeper.org is built and maintained by Richard Cross and the team at Regis Consulting. I started building minesweeper.org in 1999 while working on my Physics PhD in order to teach myself web development. I have been in software development ever since, working on everything from enterprise platforms to indie web projects. I built Minesweeper.org because I wanted to create the best free minesweeper experience on the web — one that's fast, fair, and fun — while raising awareness for a cause that matters. You can see the original site on the Internet Archive here.

Have questions, feedback, or a bug to report? Reach out at rcross@fiberxl.com.

Technical Details

  • Backend: Python and FastAPI
  • Frontend: Vanilla JavaScript with server-rendered HTML
  • Hosting: AWS
  • Open source: The project is on GitHub and has contributions from Earl Gero and William Murray.

The site is designed to be fast, lightweight, and accessible. It works on desktop and mobile browsers without requiring any downloads or plugins.

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