Reversi
Flip your opponent's pieces and dominate the board!
How to Play
Goal
Have more pieces of your color on the board than your opponent at the end.
Gameplay
Place a piece so that you trap at least one opponent piece between your new piece and an existing one of yours.
Flipping
All trapped opponent pieces are flipped to your color – horizontally, vertically, and diagonally.
Winner
When neither player can move, the one with more pieces wins. Equal counts result in a draw.
Strategy & tips
Count moves, not discs. Leading in the middlegame often loses — lots of your own discs means lots of vulnerable edges. Strong players deliberately keep their count low and flip late.
The four corners are irreversible. A corner disc can never be flipped again and anchors whole lines. That makes the squares next to them dangerous: playing there opens the corner for your opponent.
Mobility beats mass. The aim is to take away your opponent's choices. When they have a single legal move you are effectively playing their game for them, so a move that preserves your options usually beats one that flips more discs.
Variants
Anti-Reversi
Fewest discs at the end wins. The whole evaluation inverts and corners become a liability.
Free setup
The four starting discs may be placed freely, which removes the extensive opening theory of the standard game.
Larger board
On a 10×10 board the mobility phase lasts longer and corners decide matters less abruptly.
How it works
1. Create a game
Click "Create Game" and receive a 6-digit code.
2. Share the code
Share the code with your friends – via WhatsApp, Telegram, or just tell them.
3. Play instantly
Your friends enter the code and you start playing immediately. No login required!
Origin
Reversi was published in England in the 1880s, with two inventors disputing authorship at the time. The fixed opening pattern in the centre used today comes from a later Japanese edition.
The game is a textbook case of how misleading an interim score can be. Games regularly flip completely in the last dozen moves, because a single corner recolours entire diagonals.
Frequently asked questions
When may I place a disc?
Only so that at least one opposing disc is enclosed between your new disc and one you already own. Every enclosed disc changes colour.
What if I cannot move?
Your turn is skipped and your opponent plays again. If neither can move, the game ends.
Is a big lead a good sign?
In the middlegame, usually not. Many discs mean little mobility — only the count after the final move matters.