Reversi is a two-player strategy game on an 8×8 board. Each disc is dark on one side and light on the other, and a single move can turn a whole line of your opponent’s discs to your color. Here you play dark against the computer, with three levels from Easy to Hard.
Setting up
The game starts with four discs crossed in the center: two dark and two light. Dark always moves first, and in this game you play dark.
Making a move
Place a disc on an empty square so that one or more of the computer’s discs lie in a straight line between your new disc and another of yours. That’s called outflanking.
Lines can run across, up and down, or diagonally, and one move can outflank in several directions at once.
Every outflanked disc, in every direction, flips to your color.
A move must flip at least one disc. Small dots on the board show every square where you can play.
Passing and the end of the game
If you have no legal move, you pass and the computer plays again. The same goes for the computer. A note above the board tells you when someone passes.
The game ends when neither side can move, usually when the board is full. Whoever has more discs wins. Equal counts are a draw.
Strategy tips
Corners are the strongest squares: a disc in a corner can never be flipped.
Avoid the squares right next to an empty corner, especially the diagonal one. They often give your opponent the corner.
Flipping lots of discs early isn’t always good. Keeping more moves open than your opponent usually wins in the long run.
Discs along an edge that run unbroken from a corner you own are safe for the rest of the game.
Levels, undo and your record
Easy looks one move ahead and makes mistakes, which suits beginners. Normal plans a few moves ahead and plays the last few squares perfectly. Hard searches deep and plays the last 14 squares perfectly.
Undo takes back your last move and the computer’s reply.
Your games are saved as you play, so you can leave and come back. Wins, win rate and your highest winning disc count are kept for each level.