Free browser game
Can you draw a perfect square freehand? This free square game is a real perfect square test — four corners, one stroke, scored instantly. Straight lines are deceptively hard because your hand wants to curve. Prove your geometry instincts are as sharp as the angles you're trying to hit.
Play in your browser on desktop or mobile, see exactly how good your square is as a percentage, and climb the global leaderboard.
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Top scores
How to play
Press and hold to trace the ghost square in one continuous stroke — all four sides, back to where you started. Release to score. The algorithm measures side straightness, corner sharpness, and equal side lengths.
Tip: slow down at the corners. Rushing through 90° turns is the most common reason scores drop.
Frequently asked questions
Trace all four sides of the ghost square in one continuous stroke, keeping the lines straight and the corners at sharp 90° angles, then close back to your start. Slowing down at the corners is the key to a high score.
Your hand naturally wants to curve, so drawing four truly straight sides with sharp 90° corners is surprisingly hard. That is exactly what the perfect square test measures.
Most players score between 70% and 85%. Anything above 90% is excellent and leaderboard-worthy, since straight lines and crisp corners are tough to hit freehand.
Yes. Draw a Perfect Square is completely free, runs in any modern browser, and needs no download, sign-up, or install.
Yes. Draw with your finger on phones and tablets, or use a mouse or trackpad on desktop.