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Flipside Online

by crokocat · Board

Flipside is reversi — the game also sold as Othello — rebuilt as a toy you can almost pick up. Discs are chunky two-colour tokens on a green felt board; when you trap a line of the other colour between two of yours, every disc in that line jumps, turns over and lands in your colour, ring by ring outward from the one you just placed.

The rule fits in one sentence: put a disc so that a straight or diagonal line of your opponent's discs sits between it and one of your own, and that whole line turns over. A move has to flip at least one disc; if you have none, your turn passes. When nobody can move — usually when the board is full — the colour with more discs wins.

Levels is a ladder against the computer, and it never ends. The first three boards are a small 6×6 to learn on, against an opponent that still makes plenty of mistakes. From level four you play the full 8×8. The computer looks further ahead as you climb and, past level eleven, plays the last moves of a game perfectly — but it never becomes flawless, so every level can be won. Level 20 is the same board and the same opponent for every player.

From level six, every third board has pebbles on it. A pebble is nobody's: it cannot be taken, and a line of discs stops at it the way it stops at the edge. Pebbles are placed symmetrically and never in the four starting cells or in a corner, but they change which squares are safe and turn a familiar opening into a new puzzle.

A won level earns one to three stars by how much of the board you end up owning — three for three quarters or more — and the highest level you have reached goes on the leaderboard. Lose, or draw, and you replay the same board.

Two players is the classic game for two people sharing one phone, tablet or laptop: the full 8×8 board, no computer, the pills at the top showing whose turn it is and how many discs each side has.

Everything on the board is drawn in 3D in the browser — the plate, the tiles, the discs, the pebbles — so there is nothing to install. The game is sized for a phone held upright and plays the same with a mouse.

How to play Flipside

Own more of the board than the other colour when the game ends:

Desktop: Click a cell with a ring. The ring under the mouse grows so you can see where the disc will go. Escape returns to the menu.
Mobile: Tap a cell with a ring. Hold the phone upright — the board is sized for thumbs.

Game modes

ModeWhat changesWho it's for
LevelsAn endless ladder against the computer. Levels 1–3 on a 6×6 board, the full 8×8 from level 4, pebble obstacles on every third level from 6. The opponent thinks further ahead as you climb and plays endgames exactly from level 11, but always keeps a small chance of a mistake. One to three stars per level; progress saved.Anyone who wants a steady climb and a reason to come back.
Two playersClassic reversi on an 8×8 board for two people on one device. No computer, no levels — just the final count.Two friends with one phone.

Tips for Flipside

Who made Flipside?

Flipside was built by crokocat game studio in 2026 — classic reversi rules on a 3D board drawn in the browser, an endless ladder of levels against a computer opponent that grows stronger without ever becoming perfect, pebble obstacle boards, and a two-player mode for one device.

Guides & tips

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About this game

Controls
Tap or click a cell with a ring on it to put your disc there. The rings show every legal move for the side to play; a cell without one does nothing. Back returns to the menu.
Supported devices
desktop, phone, tablet
Developer
crokocat
Genre
Board
Release date
September 2026
Latest update
September 2026

Related categories

puzzleclassicboardstrategylogic3d

Frequently asked questions

Is Flipside free to play?

Yes. Flipside is free on crokocat with no download and no sign-up — it runs in your browser on desktop, phone and tablet.

Is Flipside the same as Othello?

It uses the same rules as Othello and reversi: trap a line of the other colour between two of yours and it turns over. The difference is the board — Flipside adds a level ladder, small 6×6 boards to start and pebble obstacles later on.

What happens if I have no legal move?

Your turn passes and the other side plays again. If neither side can move, the game ends and the colour with more discs wins.

How many levels are there?

The ladder is endless. The first three levels use a 6×6 board, from level 4 it is the full 8×8, and every third level from 6 has pebbles on it. Your level and stars are saved on your device.

How strong is the computer?

It starts weak and makes mistakes on purpose, then looks further ahead as you climb and plays the last moves of each game perfectly from level 11. It never becomes flawless, so every level can be beaten.

What are the grey pebbles?

Pebbles are cells nobody can take. A line of discs stops at a pebble just as it stops at the edge of the board, so pebbles change which squares are safe.

Can two people play?

Yes — pick Two players on the start screen and pass the device between you after each move.