PERFECT
SHAPE
Draw a circle, find the center and split shapes in half. Explore 12 geometry challenges and six-part sessions in this free browser drawing game.
YOUR BEST
—
ATTEMPTS
0
TYPICAL RUN
60–90s
IN DAILY
YES
Raw stroke points stay in your browser and are not part of product analytics. Drawing is an essential pointer mechanic; timing and estimation games are available as non-drawing alternatives.
Accessibility: Drawing is an essential pointer mechanic. The site shell, instructions and results are accessible, and non-drawing games are linked as alternatives.
Draw, center and split with surprising precision.
The interactive challenge is loading.
LOADING
HOW TO PLAY
- Progress through geometry levels: draw one continuous circle, identify the center of a generated shape and draw a line that splits a convex shape into equal areas.
- The drawing stage uses Pointer Events and captures the active pointer, so a stroke can safely cross the canvas edge before returning.
- Each mode reveals a concise error explanation. The final geometry score combines the challenges in this level, while their raw measurements remain visible.
WHAT YOUR SCORE MEANS
Circle scoring compares closure, radial consistency, angular coverage and low-weight smoothness after resampling the stroke to a stable number of points.
Center error is normalized by shape size. Split error uses exact polygon clipping and area rather than counting screen pixels. These choices keep results stable across viewport size and device-pixel ratio.
GAME SCORES · SAVED IN THIS BROWSER
Explore the 12-level Perfect Shape course
Finish each level, then continue to the next. These goals are optional precision challenges; your score never blocks progress. After level 12, keep playing fresh bonus rounds at the final difficulty. Your place and level bests are saved in this browser.
- First steps. Draw a circle. Score at least 500 / 1000.
- Find your rhythm. Find the center. Score at least 550 / 1000.
- A little further. Split the area in half. Score at least 600 / 1000.
- Steady hands. Draw a circle. Score at least 650 / 1000.
- Keep it close. Find the center. Score at least 650 / 1000.
- New territory. Split the area in half. Score at least 700 / 1000.
- Stay focused. Draw a circle. Score at least 700 / 1000.
- Trust your eye. Find the center. Score at least 750 / 1000.
- The long way. Split the area in half. Score at least 750 / 1000.
- Fine margins. Complete all three geometry challenges. Score at least 800 / 1000.
- Almost there. Complete all three geometry challenges. Score at least 800 / 1000.
- Final challenge. Complete six geometry challenges. Score at least 850 / 1000.
QUESTIONS
How is a hand-drawn circle scored?
The algorithm resamples the path, fits a circle and combines four bounded quality components. An open arc, ellipse or spiral cannot score highly from radius variation alone.
Why is the split calculation not based on pixels?
Pixel counting changes with resolution and antialiasing. Polygon half-plane clipping produces a geometric area ratio independent of screen density.
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