Reversi vs AI
Play Reversi free in your browser. No download and no sign-up: outflank the disc against four AI levels up to a tough Master engine, face a friend on one screen, or open an online room and share the link.
Reversi is a classic two-player game on an 8x8 board played with double-sided discs that are black on one side and white on the other. You place a disc to trap a line of your opponent's discs between the new disc and another of your own, and every trapped disc flips to your colour. When neither side can move, whoever has more discs on the board wins. The rules take under a minute to learn, yet the swings are dramatic: a single move can flip an entire row.
Why Play Reversi Here
Everything runs right in your browser. There is no app to install and no account to create — open the page, the four starting discs are set, and you close the tab when you are done. It plays the same on a phone, a tablet or a desktop.
You can play solo against the computer at four strengths — from a gentle Easy up to a demanding Master engine that values corners and mobility — pass-and-play with a friend on one screen, or open an online room and invite someone with a single link. Every legal move is marked with a dot, the discs flip with a satisfying animation, the live disc count is always on screen, and an undo button, a hint and full replay help you learn.
How to Play Reversi Online
Pick a mode: play against the AI at easy, medium, hard or Master, or choose same-device two-player. Black always moves first, and the board starts with two black and two white discs in the centre.
On your turn, the squares where you can legally play are shown as dots. A move is legal only if it traps at least one straight line — horizontal, vertical or diagonal — of your opponent's discs between the disc you place and a disc you already own. Click a marked square to place your disc and watch the trapped discs flip to your colour.
Rules and Passing
If you have no legal move, your turn is skipped automatically and play passes back to your opponent — the board shows a short notice when this happens. The game ends when neither player can move, which is usually when the board is full but can happen sooner.
At the end, the discs are counted: the player with more discs of their colour wins, and an equal count is a draw. Because flips can be huge, the lead changes hands constantly, so the disc count in the middle of the game matters far less than who controls the corners.
Strategy for Beginners
Corners are the key to Reversi: a disc in a corner can never be flipped, so it anchors whole edges. Avoid the squares diagonally next to an empty corner (the 'X-squares') early on, because they hand your opponent the corner.
Counter-intuitively, having fewer discs in the early game is often good — it keeps your options open and limits your opponent's moves. Aim for mobility (always having safe moves), take stable edges and corners, and save the big flips for the final few turns when they can no longer be reversed.
Tips to Improve Faster
- Grab corners whenever you safely can — corner discs are permanent.
- Avoid the squares next to an empty corner; they give the corner away.
- Don't rush to flip the most discs early — quiet, low-disc positions are strong.
- Aim to keep more legal moves than your opponent (mobility).
- Use the hint button to compare your idea with the engine, then step up to Hard and Master.
Frequently Asked Questions
How does a game of Reversi start and end?
The board opens with two black and two white discs in the centre and Black moves first. The game ends when neither player can move — usually when the board is full — and whoever has more discs of their colour wins.
Is this Reversi game really free?
Yes. You can open and play as many games as you like for free, with no sign-up and no download required.
Can I play Reversi against the computer?
Yes. Choose Solo vs AI and pick easy, medium, hard or Master. The Master engine looks several moves ahead and prizes corners and mobility.
What happens if I can't move?
Your turn is passed automatically and the board shows a brief notice. If neither player can move, the game ends and discs are counted.
Do I need to create an account?
No. Everything runs in your browser and your session record is stored locally, so you can start playing immediately.
