Flipside

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Overview

Flipside is played on a square board by two colours, dark and light, with dark moving first. Each move places one disc so that it closes at least one straight line of the other colour between the new disc and one already on the board, across, down or diagonally. Every disc in those lines turns over to the mover's colour.

A player with no such move passes, and the game ends when neither side can move. The colour with more discs on the board wins. Play the computer at one of three strengths, or a friend on the same screen, on a 6 by 6, 8 by 8 or 10 by 10 board.

Made by: wasmga.me
Released: 2026

Controls guide

Playing

Key	Action
Click/touch	Place a disc on a square that turns something over
`Arrow keys`	Move the square cursor
`Space`/`Z`	Place a disc under the cursor
`X`	Take back your last move, and the computer's reply
`Enter`/`P`	Pause

Cheatsheet

Options

Play with: Easy, Normal or Hard computer, or a friend taking turns
You are: Dark moves first; light moves second
Hints: Show or hide the small dots

On the board

Small dots: Squares the player to move can take
Ring: The last disc placed

Scoring

Win: 1000 plus 50 for each disc you are ahead
Loss or draw: 1 for each disc you end with
Strength: Times 1 for Easy, 2 for Normal, 4 for Hard
Undo: A game where you took a move back still counts, but scores nothing
Scoreboards: One for each strength and board size; games with a friend score nothing

Tips

Corners can never be turned over, and a disc on the edge next to a corner owned by you is just as safe. Aim for the corners first.
Avoid the square diagonally next to an empty corner: it usually hands that corner to the other side.
Having many discs early matters less than having many moves. A position where the other side has few legal squares often forces it into a bad one.
On Hard the computer plays the last nine or so squares perfectly, so try to settle the edges before the end.