All categories
CATEGORY 01

Visual intuition.

How good is your eye for length, area and volume?
Divide a line. Balance a shape. Match an amount.

FOUR LIVE TESTS

Choose what to measure.

10 rounds each · a different skill in every test

01 / AREA

Half & Half

Move a line until both areas are equal.

Start test
02 / LENGTH

Line Split

Find halves, thirds and fractions. Then try tilted lines.

Start test
03 / VOLUME

Equal Pour

Match an amount across glasses and connected chambers.

Start test
04 / ANGLES

Angle Set

Set an angle, then try rotated rays and triangles.

Start test
Want the same shapes as everyone else today?Half & Half daily set
Explore the 10 shapes in Half & Half Randomized proportions · simple to fractal
ONE SHAPE AT A TIME · NEW GEOMETRY EVERY SET

From simple to wonderfully tricky.

Side lengths, heights and widths change. Triangles, trapezoids and pentagons also vary their angles. Lines show equal-area splits for these examples. Your test generates a fresh set.

  1. 01

    Rectangle

    Warm-up

  2. 02

    Triangle

    A new angle

  3. 03

    Trapezoid

    Shifting proportions

  4. 04

    Pentagon

    Asymmetry

  5. 05

    Steps

    Changing heights

  6. 06

    Notched shape

    Getting intricate

  7. 07

    Crown

    Reading the gaps

  8. 08

    Fork

    Following the branches

  9. 09

    Pythagoras tree

    Three branch levels

  10. 10

    Fractal finale

    Eight branching levels

How does Half & Half scoring work?

Harder rounds are worth more, from 40 to 220 points (1000 per set). Accuracy starts at 100%; we subtract four times the percentage-point distance from a perfect 50% split, then round to the nearest point. A 48% / 52% split earns 92% of the round’s available points. The minimum is 0; a perfect task total is 1000.

Instinct Score is the task total. Instinct’s Core separately measures how accurately you predict your rank among other attempts. Optional calls sit beside the game; a final rank call opens your report. Heatmaps show real anonymous answer errors for the same test edition and round. Percentiles appear from 30 comparable attempts.

MORE IN THIS CATEGORY

Next in visual intuition.

10 measured rounds in each test.
Discover a different side of your intuition.

Coming soon

Hands Only

Set a given time using only the hands of a clock. The dial has no numbers, ticks or other reference marks.

10 CHALLENGES

Whole hours first, then increasingly tricky minute positions.