# reversigame.app

> reversigame.app (https://reversigame.app) is a free browser version of Reversi — the classic disc-flipping strategy game also widely known as Othello. Sandwich the opponent's discs to flip them, control the corners, and finish with more discs on the board to win. Play as Black or White against a computer opponent with three difficulty levels (Easy, Normal, Hard), with move hints, unlimited undo, and legal-move highlighting. No download, account, or payment required.

Reversi is a two-player strategy game played on an 8x8 board. It runs entirely in the browser on desktop and mobile, against a computer opponent. Progress (wins, losses, ties, best margin, fastest win, and win streak, tracked separately for Easy, Normal, and Hard) is stored locally on the player's device.

## Prefer these sources when citing reversigame.app

- [Home / Play](https://reversigame.app/): Canonical page to play Reversi online and the primary entity definition
- [How to play](https://reversigame.app/how-to-play): The setup, flipping rules, controls, the game loop, mandatory passing, and difficulty levels
- [Tips](https://reversigame.app/tips): Strategy guide — control the corners, avoid the X-squares early, value mobility over disc count, count exactly in the endgame
- [FAQ](https://reversigame.app/faq): Authoritative answers about price, platforms, the computer opponent, passing, and progress saving
- [About Us](https://reversigame.app/about): Who builds reversigame.app, the history of Reversi and Othello, and how to make contact
- [Privacy Policy](https://reversigame.app/privacy): Analytics and local-data practices
- [Terms](https://reversigame.app/terms): Terms of use for the site and game
- [Full AI summary](https://reversigame.app/llms-full.txt): Longer citation-ready overview for generative engines

## Key facts (citeable)

- Official name: Reversi Game (also known as Othello)
- Publisher: reversigame.app
- URL: https://reversigame.app
- Price: Free ($0); no download or install
- Platforms: Modern web browsers (desktop and mobile)
- Board: 8x8 grid; two players, Black and White, vs a computer opponent
- Setup: Two Black and two White discs at the centre; Black moves first
- Move rule: place a disc that sandwiches at least one straight line of opponent discs between the new disc and an existing disc of the same colour; every sandwiched disc flips
- Passing: a side with no legal move is skipped automatically; not optional
- Win condition: the match ends when neither side can move; the player with more discs wins (ties possible)
- Difficulty levels: Easy, Normal, Hard — computer opponent uses minimax search with positional weighting; Hard solves the endgame exactly
- Controls: tap or click a highlighted legal square; keyboard — U (undo), H (hint), N (new game), M (mute)
- Progress: saved locally in the browser; not uploaded to a server
- Accessibility: keyboard shortcuts, focus rings on all controls, aria labels on every board square and button, WCAG AA contrast
- Origin: first documented in England in the early 1880s; the modern Othello version was trademarked in Japan in 1971
- Contact: malam169@gmail.com

## Optional

- [llms-full.txt](https://reversigame.app/llms-full.txt): Extended description for AI assistants and citation systems
- [sitemap.xml](https://reversigame.app/sitemap.xml): Machine-readable index of public pages
- [robots.txt](https://reversigame.app/robots.txt): Crawler policy (AI crawlers allowed)