About Reversi Online — Reversi Online & Othello Game Online Free
Reversi is a classic two-player strategy board game played on an 8×8 grid. You play as Black, and the computer plays as White. The goal is to have more discs of your color on the board than your opponent when no more moves can be made. Every move must outflank at least one opponent disc — meaning your newly placed disc must trap one or more of their discs between itself and another disc of your color. All trapped discs flip instantly to your color. Play reversi online free in your browser with no download or account required.
Reversi was invented in England in 1883 by Lewis Waterman and John Mollett. In 1971, Japanese entrepreneur Goro Hasegawa rediscovered the game, refined the rules, and released it commercially as "Othello" — named after the Shakespeare play to evoke the theme of dramatic reversals. The game became an international sensation through the 1970s and 1980s. The Othello World Championship has been held annually since 1977. Despite its simple rules — any beginner can learn in two minutes — Reversi has an estimated 10^28 legal positions, giving it a strategic complexity that rivals chess for the advanced player.
Controls
Click a highlighted cell — Small dots mark the cells where you can legally place your disc. Click one to make your move.
New Game button — Start a fresh game at any time. The board resets to the standard four-disc starting position.
How to Play Reversi Online
The game begins with two black and two white discs placed in the center in a diagonal pattern. Black (you) always moves first. On your turn, click any highlighted cell — these are the only positions where at least one of your opponent's discs will be outflanked. When you place your disc, all white discs sandwiched between your new disc and any existing black disc in a straight line (horizontal, vertical, or diagonal) flip to black. If you have no valid moves your turn is skipped automatically. The game ends when neither player can move, and the player with the most discs wins.
Tips & Strategies
Corners are the most valuable squares. A disc placed in a corner can never be flipped. Capturing all four corners almost always guarantees victory, so prioritize moves that lead toward corner control.
Avoid giving your opponent corner access. The squares immediately adjacent to empty corners (called C-squares) are dangerous to occupy because they give your opponent a path to the corner. Only play them when you can immediately follow up by taking the corner yourself.
Control the center early. In the opening game, focus on occupying the four central squares. Central control gives you more valid moves and limits your opponent's options.
Count mobility, not disc count. Having more discs midgame is often a trap — a large disc count means your opponent has fewer flippable targets and you have fewer valid moves. Prioritize keeping your options open over raw disc totals.
Use X-squares cautiously. The X-squares (diagonal to corners) are the second most dangerous positions. Only occupy them when you can immediately take the adjacent corner on your next turn.
Skills You Develop
Reversi is an exceptional game for developing strategic thinking. Because every move changes the board dramatically — a single placement can flip ten or more discs — players must think several moves ahead and evaluate positions carefully. The game teaches you to look beyond the immediate gain (flipping the most discs now) in favor of long-term positional advantage. This concept of deferred gratification and positional thinking translates directly to chess, business strategy, and negotiation.
Playing Othello online regularly also sharpens pattern recognition. Experienced players quickly identify dangerous board configurations — like opponent discs lined up toward an empty corner — and respond proactively. The game also builds the ability to hold multiple possibilities in working memory simultaneously, which is a core component of fluid intelligence tested in cognitive assessments.
Frequently Asked Questions
The CPU uses a greedy strategy — it evaluates every legal move and picks the one that flips the most of your discs in a single turn. This makes it a solid and consistent opponent that punishes careless play, but it does not look multiple moves ahead. An experienced human player who understands corner strategy can reliably beat it by sacrificing short-term disc count for positional superiority.
When you place a disc, the game checks all eight directions from that cell. In each direction, if there is a continuous line of opponent discs ending in one of your discs already on the board, all of those opponent discs in that line flip to your color. You can flip discs in multiple directions simultaneously with a single placement. A move is only legal if it flips at least one disc.
If you have no legal moves on your turn, your turn is automatically skipped and the CPU plays again. This can happen even in the middle of the game if your pieces are completely surrounded. The game only ends when neither player has any valid move — not when just one player is stuck. You may regain valid moves after the CPU plays.
Corner discs can never be flipped because there is no direction from which they can be outflanked. Once you occupy a corner, all discs in the two rows and two columns extending from it become anchored and very difficult to flip. This gives you a stable foundation that compounds your advantage throughout the game, which is why corner control is the single most important strategic principle in Reversi.
Yes, a draw is possible but uncommon. If the game ends with exactly 32 black and 32 white discs on the board, the result is a tie. This can also occur if both players run out of moves before the board is full, resulting in equal disc counts. The game screen announces a draw in this case. With optimal play by both sides, Reversi is theoretically a draw, though this requires perfect play at a very high level.
Yes, completely free. No sign-up, no download, and no ads blocking gameplay. The game runs entirely in your browser using standard HTML and JavaScript. You can play as many games as you like on any device without any cost or registration. Simply open the page and click New Game to start playing reversi online immediately.
Yes. The game is fully touch-compatible. Tap the highlighted cells to place your disc on any smartphone or tablet. The board scales responsively to fit smaller screens, including compact phone displays. The game works in all major mobile browsers including Chrome, Safari, Firefox, and Edge without any installation or app download required.
Reversi develops strategic planning, positional thinking, and the ability to evaluate trade-offs between short-term and long-term gains. Regular play strengthens working memory (holding the board state in mind), pattern recognition (spotting dangerous configurations quickly), and inhibitory control (resisting the impulse to take immediate gains when a longer-term strategy is better). These are core executive function skills with real-world applications.