Trap rival discs between yours and flip the board. Flip Four is a free 2 player reversi board game to play on one phone or vs the computer. Outflank rival discs, flip them to your colour and own the board.
How to play
Flip Four is played on an eight-by-eight board. Each player starts with two discs crossed in the middle, and Red moves first. On your turn you place one disc on an empty square so that it traps a straight line of rival discs between the new disc and another disc of yours. Lines can run across, up and down, or diagonally, and one disc can trap lines in several directions at once. Every trapped disc flips over to your colour.
- Tap a glowing dot to place a disc. The dots show every square where you are allowed to play, so you never have to guess.
- On a computer, hover over a square to preview your disc, then click. You can also move a cursor with the arrow keys and press Space to place.
- You must flip at least one disc. A square that would not trap anything is not a legal move.
- If you have no legal move, your turn is passed automatically and a message tells you so. Your rival keeps playing until you can move again.
Playing the computer
Tap the second seat on the setup screen to switch it to CPU, then choose a level:
- Easy looks one move ahead and now and then plays a random disc.
- Normal looks three moves ahead.
- Hard looks five moves ahead and weighs corners, edges and how many choices each side will have.
Scoring
The game ends when neither player can move, which usually means the board is full. The player with more discs of their colour wins, and the score cards at the top count every flip as it happens. An equal count is a draw. Each disc also carries a small shape, a circle for Red and a square for Blue, so the two sides are easy to tell apart without relying on colour.
Tips
- Corners are gold. A disc in a corner can never be flipped, and it anchors the edges next to it.
- Avoid the squares beside an empty corner. Playing there often hands the corner to your rival.
- Fewer discs can be better early on. Grabbing lots of discs in the opening tends to leave your rival with more options later. Aim to keep your own choices open and squeeze theirs.
- Edges are strong but not safe. An edge disc can still be flipped along the edge, so check both ends of the line.
Why it’s fun
Flip Four takes a minute to learn and a lifetime to master. Positions can swing wildly in the last few moves, so no game is over until the final disc lands. It is a great pick for a quick match with a friend on the sofa or a thinking break against the computer.