Draw a Perfect Circle

How to play

Draw one circle in a single stroke, with your mouse or your finger, then lift to see your score. There is no trick to it, just a steady hand and a good eye. Take as long as you like on each stroke; the score only cares about the shape, not the speed.

The game fits the best possible circle to your stroke, then measures how far each point sits from that circle. Your score is 100 minus the average gap as a share of the radius, so a perfect circle scores 100%. After scoring, the ideal circle appears in green over your stroke, with a dot at its center, so you can see exactly where your line drifted.

Scores of 90% or better show in green, 70% to 90% in orange, and below 70% in red. A score of 90% earns a Nearly perfect verdict, and 95% or better earns the Inhuman one. Each round stands alone and your best score is not saved, so just draw again and try to beat your last number. If you only tap or draw a tiny dot, the game clears the board and lets you try again.

FAQ

How is the score calculated?

The game fits the best possible circle to your stroke, then measures how far each point of your stroke sits from that circle. Your score is 100 minus the average gap as a share of the radius, so a perfect circle scores 100%.

What is the green circle?

After scoring, the game draws the ideal circle in green over your stroke, with a dot at its center, so you can see exactly where your line drifted.

What does avg wobble mean?

It is the average distance, in pixels, between your stroke and the perfect circle. A smaller number means a rounder circle.

What if I only tap or draw a tiny dot?

The game tells you that was more of a dot, clears the board, and lets you try again with a real circle.

Does the game save my best score?

No. Each round stands alone, so just draw again and try to beat your last number.

Can I play on my phone?

Yes. Draw with your finger and the scoring works exactly the same as with a mouse.

Tips

• Draw from your shoulder rather than your wrist, and keep your speed steady.
• Do not stop and correct yourself halfway round. A smooth, slightly imperfect circle reads as rounder than a wobbly one you kept patching.
• If your circles always lean the same way, start the stroke from a different point and see if the lean follows.
• When your score stalls, change one thing at a time: your speed, your starting point, or the size of the circle.