# Reversi Online

> An independent, free browser implementation of Othello, the two-player disc-flipping strategy game often called Reversi online. An independent browser game. Not affiliated with or endorsed by Othello Co., MegaHouse or the World Othello Federation.

Othello is a registered trademark of MegaHouse Corporation. References to Othello identify the game and rules discussed here.

## Direct facts

- Play URL: https://othello-game.online/
- Board: 8 by 8 squares. Start with white at D4 and E5, black at E4 and D5. Black moves first.
- Legal move: place on an empty square to outflank one or more opposing discs in a straight horizontal, vertical or diagonal line ending with your own disc. Flip every directly captured line.
- Passing: mandatory when no legal move exists. End when neither player can move, even with empty squares remaining.
- Result in this implementation: count discs on the board; higher count wins; equal count is a draw. Empty squares are unassigned. Tournament recording conventions may differ.
- Computer mode: player is black; computer is white. Easy, Medium and Hard use local, time-limited search. Not a perfect solver or hosted generative AI service.
- Two-player mode: two people share one device. No remote multiplayer, rooms, friend links or matchmaking.
- Access: free, no login or app installation. JavaScript is required to play; the guides are static HTML.
- Saves: board, move history and settings in local browser storage. No account or device synchronization. A connection is required to load; offline reopening is not guaranteed.
- Othello and Reversi are overlapping modern names with historical rule differences. Othello is distinct from Go.

## Pages

- [Play Othello](https://othello-game.online/): Play Othello / Reversi online for free: 3 computer levels or 2 players on one device. No login or download. Independent game with rules and beginner tips.
- [How to play](https://othello-game.online/how-to-play/): Learn Othello rules with an illustrated first move: board setup, legal moves, flipping discs, passing, scoring and a practical beginner checklist.
- [Strategy](https://othello-game.online/strategy/): Improve your Othello decisions with practical beginner strategy: protect corners, avoid risky X-squares, limit mobility and review your endgame.
- [Play vs computer](https://othello-game.online/play-vs-computer/): Play Othello against the computer in your browser. Choose Easy, Medium or Hard, use legal-move hints and undo a turn. Free, with no login or download.
- [Two-player Othello](https://othello-game.online/two-player/): Play two-player Othello on one phone, tablet or computer. Take turns as black and white with automatic flips, legal-move hints and no account needed.
- [Othello vs Reversi](https://othello-game.online/othello-vs-reversi/): Understand Othello and Reversi: why the names overlap, how historical rules differ and which four-disc opening this browser game uses.
- [Othello vs Go](https://othello-game.online/othello-vs-go/): Compare Othello and Go: board size, where pieces go, captures, passing and scoring. Learn which black-and-white board game you are looking for.
- [Common questions](https://othello-game.online/faq/): Answers about playing Othello online, legal moves, passes, draws, computer levels, local two-player mode, browser saves and mobile controls.
- [About & sources](https://othello-game.online/about/): See who this independent Othello / Reversi game represents, which rules it uses, its source references and its non-affiliation with the rights holders.
- [Privacy](https://othello-game.online/privacy/): How Reversi Online handles local saved games, browser storage, hosting requests and external links. No site accounts, ad tags or analytics scripts.

## Primary references

- [World Othello Federation: rules](https://www.worldothello.org/about/about-othello/othello-rules)
- [World Othello Federation: history](https://www.worldothello.org/about/about-othello/othello-history)
- [Reversi reference and bibliography](https://en.wikipedia.org/wiki/Reversi)
- [MegaHouse Othello trademark reference](https://www.megahouse.co.jp/othello/)
- [British Go Association: introductory rules](https://www.britgo.org/intro/intro2.html)

## Editorial policy

Reviewed November 14, 2026. Strategy advice is editorial and is not a guaranteed winning procedure. Website-specific capabilities describe this implementation, not every Othello product. No invented ratings, official endorsements or user statistics. This file supplements visible content and does not guarantee indexing or AI citations.