Draw It Perfect
Five small precision tasks on a sheet of drafting paper: split a shape exactly in half, find its centre, draw a circle and a square freehand, and copy an angle from memory.
Practice
Equal halves
Drag one straight cut across the shape to split it into two equal areas.
Personal bests on this device
| Task | Mouse | Touch | Pen | Keyboard |
|---|---|---|---|---|
| Equal halves | – | – | – | – |
| Centre point | – | – | – | – |
| Circle | – | – | – | – |
| Square | – | – | – | – |
| Angle | – | – | – | – |
Touch, mouse, pen and keyboard are kept apart; assisted attempts never count.
About Draw It Perfect
Draw It Perfect measures how close your hand and eye get to a geometric target. Each task is marked the way a draughtsman would mark it: the circle is fitted to your stroke and every part of it is coloured by how far it strays; a square shows the stretches you missed; a cut through a shape shades both pieces and prints their share of the area; a centre tap shows where the true balance point was.
The score is always a plain measurement, such as the average distance from a perfect circle as a share of its radius, so you can see why you got the number you did. Scribbles, taps, double loops and half-finished strokes cannot score well: those are rejected or scored zero with the reason given. Mouse, touch, pen and keyboard attempts keep separate bests, because they are different skills.
How to play
- Choose Practice or the Daily five, and in Practice choose a task.
- Equal halves: drag one straight line right across the shape, starting and ending outside it.
- Centre point: press where you think the shape would balance, and let go.
- Circle: draw one circle anywhere in a single stroke. Square: trace the dashed square in one stroke and finish where you started.
- Angle: press Show angle, remember the ray for a second and a half, then set your ray to match and press Submit angle.
- Read the marking on the sheet and the explanation, then Retry or try a new task.
Controls
- Draw with a mouse, finger or pen. Only one finger at a time: a second touch cancels the attempt.
- The page cannot scroll while your finger is on the sheet waiting for a stroke; scroll with the area around it.
- Equal halves and Centre point also work from the keyboard: focus the sheet, use the arrow keys (Shift for fine steps), then Enter.
- Angle: drag the ray, use the rotate buttons, or focus the sheet and use the arrow keys (Shift for 0.1 degree). Enter submits.
- After a result, Enter retries the same task.
The rules
- Circle: 100 times (1 minus 3 times the radial error) times (1 minus 2 times the gap between the ends) times coverage times a length factor. A stroke that goes round more than about one and a third times, or less than two thirds of the way, scores zero.
- Square: the average distance between your stroke and the square, both ways round, as a share of a side. The ends must meet within 12 percent of a side and every edge must be traced along at least three quarters of its length.
- Equal halves: 100 times (1 minus twice the difference between the two areas over the total). The cut must cross the shape.
- Centre point: the target is the true centre of area, not the middle of the bounding box; the score falls to zero a quarter of the shape's size away.
- Angle: the score falls to zero at 45 degrees of error. The exact error is always shown.
Scoring, saving and limits
Every score is from 0 to 100 and shown to one decimal. The daily five gives the same five tasks (one of each) to everyone on the same UTC date; only your first attempt at each counts, and the game total is the simple sum out of 500. Retrying a halves, centre or angle task after seeing its answer is marked assisted and never becomes a best.
Your last 100 attempts and your bests are saved in this browser only. Download a backup to keep them or move them to another device; an imported backup is checked first and can be undone. A challenge link holds only the task itself.
This is a game of hand and eye precision on this device. It is not a medical, motor, intelligence or drawing-skill assessment, and a score card is a picture of a result, not a verified record. There are no global rankings.
Accessibility
Freehand drawing depends on vision and fine pointer control, so it cannot be made equivalent without them. The centre, halves and angle tasks can be played with the keyboard, and scores, explanations and bests are text announced to screen readers. Keyboard results are kept apart from pointer results.
Questions
- Why did my circle score zero?
- Usually the stroke went round more than once or stopped well short. The explanation under the score says which. Only one lap counts.
- Does screen size change the score?
- No. Every stroke is converted to the same 400 by 400 sheet before it is measured, so the same shape scores the same on a phone and a monitor.
- Why is my retry marked assisted?
- After a halves, centre or angle result you have seen the answer, so a retry of the same task would not be a fair best. Choose New task for a fresh one.