The Multiplayer Perfect Circle Competition is a pass-and-play drawing game for two or more players sharing one screen. Each player draws a single freehand circle with the mouse, and the game scores how round it is, out of 100. This Multiplayer Perfect Circle Competition needs no sign-up, no download and no online rooms. Add your names, take turns drawing, and see whose circle is roundest.
How to use the Multiplayer Perfect Circle Competition
- Type a name in the “Player name” box and click “Add Player”. Repeat for every player. Each name appears in the list under the box.
- Click “Start Competition”. The game calls the first player by name.
- On your turn, press the mouse button on the 400 × 400 canvas and draw one full circle in a single stroke.
- Release the mouse button to finish. Your accuracy score appears at once, as a percentage.
- Pass the mouse to the next player. After the last player, the final scores appear, best score first.
Scores live only in this page. Refresh the page to clear the names and play again.
Worked example
Say Ana, Ben and Cara play. The game finds the centre of Ana’s drawing by averaging all her mouse points. It then measures how far each point sits from that centre. A perfect circle keeps every point at the same distance, the radius. Ana’s points sit, on average, 1.9 pixels away from her average radius, so she scores 100 − 1.9 = 98.05%. Ben draws a clear oval instead. His distances vary by 14.3 pixels on average, so he scores 85.73%. Cara draws fast and her hand shakes near the end. Her distances vary by 8.9 pixels on average, so she scores 91.05% and takes second place. The game does not check whether the ends of the line meet. An open curve is scored for roundness only.
Example results
These sample scores were worked out with the game’s own formula. Your hand, of course, will draw differently.
| Sample drawing | Average distance error | Sample score |
|---|---|---|
| Smooth large circle, even stroke | About 0.8 pixels | 99.19% |
| Steady circle with a small wobble | About 1.9 pixels | 98.05% |
| Slight oval, a little wider than tall | About 4.8 pixels | 95.21% |
| Wobbly circle, uneven hand | About 8.9 pixels | 91.05% |
| Clear oval shape | About 14.3 pixels | 85.73% |
Limits and good to know
- This is a local game. All players share one screen and one mouse. There is no online joining, room code or link to send.
- Drawing is mouse only. The canvas listens for mouse events, so touch drawing on phones and tablets is not built in.
- The score uses pixels, not a percentage of size. A wobble of 10 pixels costs about 10 points, whatever size circle you draw.
- One stroke per turn. Lifting the mouse, or sliding off the edge of the canvas, ends your turn and scores what you have drawn.
- A tiny scribble is not scored. The game asks you to draw a larger circle instead, and your turn stays open.
- There is no save or history. Scores are gone when the page reloads.
Why is my result empty or wrong?
Most problems come from the turn order or a stroke that ended early.
- Nothing happens when you draw: no players are in the game yet. Add at least one name, then click “Start Competition”.
- You see “Please add at least one player”: the name box was empty when you pressed start. Type a name and click “Add Player” first.
- Your turn ended before you finished: your mouse left the canvas. Leaving the square ends the stroke, so draw well inside the edges.
- Your score is lower than you expected: the middle of your circle drifted, or the shape was oval. Both push the distances apart and lower the score.
- Your drawing vanished: the canvas clears itself at the start of every turn and every new stroke, so a fresh blank square is normal.
Why use this Multiplayer Perfect Circle Competition?
It turns one computer into a quick group game with no accounts, no installs and nothing to set up. The scoring rule is open and simple, so a loss is easy to understand and a rematch takes seconds. It suits classrooms, breaks and family contests where everyone can gather around the same screen. A game with four players takes about a minute, so it fits easily into a short break.
Multiplayer Perfect Circle Competition – frequently asked questions
Is the Multiplayer Perfect Circle Competition played online?
No. It is a pass-and-play game on one device. Players share the same screen and mouse, and take turns one after another.
How is my circle score worked out?
The game averages your mouse points to find the centre, measures each point’s distance from it, and takes the average error in pixels away from 100.
Can I play on my own?
Yes. Add one name and start. You get a score for your circle, and you can refresh the page to try to beat it.
Are my name or drawings uploaded anywhere?
No. Names and drawings stay in the page in your browser. The game code makes no uploads and has no server to send them to.
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