Reversi
Reversi is an eight-by-eight strategy board game: place a disc to surround opponent discs, flip the chain, and finish with more discs than the AI.
World and Mission
A match begins with four discs in the center and opens into a contest for space. Every legal move must bracket one or more opponent discs between your new disc and an existing disc.
The board can change quickly: a move that flips many discs now may give away a corner or reduce your next options. The final count decides the winner.
How the Systems Work
Choose a legal empty square that brackets an opponent line in one of eight directions. Every bracketed disc flips to your color.
The AI replies at Easy, Medium, or Hard. Hint marks the first legal square in board order, not a tactical recommendation; live feedback describes corners, edges, or your legal-move count after the AI reply.
When one side cannot move, the turn passes automatically. When neither side has a legal move, Result compares disc counts. Replay starts a fresh four-disc opening at the selected difficulty.
How to Play
- Choose Easy, Medium, or Hard and start the board.
- Read the highlighted legal squares and choose one that flips a useful line.
- Wait for the AI reply, then read the corner, edge, or mobility feedback.
- Use Hint when you want one legal candidate without giving up the decision.
- Keep playing through automatic passes. When neither side can move, compare the final disc counts and use Replay for a new plan.
Strategy Tips
- Corners cannot be flipped, so consider a corner before chasing a larger capture.
- Watch the square next to an open corner; giving it away can hand the corner to the AI.
- Compare your legal-move count before and after a move to keep mobility when possible.
- A smaller early flip can be stronger if it protects an edge or preserves future choices.
Campaign and Difficulty Growth
Easy chooses the fewest immediate flips and Medium the most. Hard scores flips, strongly favors corners and edges, and penalizes squares beside an open corner. Replays challenge you to plan around the same rules.
Developer Design Note
Reversi uses a readable eight-by-eight board, explicit legal-move targets, three transparent AI policies, advisory Hint, and localized payoff feedback so strategy stays visible rather than mysterious.
Player, Device, and Save Information
Language and sound preferences may remain in this browser. The current match is not saved across a reload. No account, purchase, cloud save, or online match is required; clearing site data may remove local preferences.
FAQ
- How is a move legal?
- Only language and sound preferences are saved in this browser. A match is not saved when you leave or reload.
- What happens to bracketed discs?
- They flip to your color in every bracketed direction.
- What does Hint do?
- Hint highlights the first legal square in board order. It does not choose the strongest move or place a disc.
- What are the AI levels?
- Easy flips the fewest discs immediately; Medium flips the most. Hard scores flips, corners, edges, and penalties for squares beside an open corner. Its choice is a heuristic, not a guaranteed best move.
- How is the winner decided?
- A side with no legal move passes automatically. When neither side can move, the game counts discs; the side with more wins.
- Does Undo reverse a move?
- No. The current Undo control announces Undo but does not restore the board or reverse a move. Use Replay to start again.
- What if a player has no legal move?
- The game passes that side automatically. Play continues if the other side has a legal move; Result appears when neither side can move.
