FAIR
SHARE
Cut cakes into equal portions with straight lines. Try 12 challenges across circles, squares, ellipses and hexagons. Free, with live area feedback.
YOUR BEST
—
ATTEMPTS
0
TYPICAL RUN
30s
IN DAILY
NO
Every cake has an equal-area solution. The 12-level journey progresses through squares, circles, ellipses and hexagons. The target and current shares stay visible.
Accessibility: Cutting requires aiming a pointer or a finger across a visual shape. Instructions and results are text; keyboard players can try Visual Memory or Even Pour.
One equal piece per person. Make every cut count.
The interactive challenge is loading.
LOADING
HOW TO PLAY
- Drag straight across the cake to make a cut. It extends edge to edge automatically — you only aim its angle and position.
- Live shares update after every cut, and pieces are tinted by how close they are: on target, too big, or too small.
- You get exactly as many cuts as the puzzle allows — once every cut is made, the round ends and the final shares are locked in.
WHAT YOUR SCORE MEANS
First make exactly the requested number of pieces. Then the 0–1000 score penalizes the spread between the largest and smallest piece, measured in percentage points of the whole cake.
Perfect is a spread of half a percentage point or less — not necessarily equal-looking pieces, since equal area and equal shape are not the same thing on a circle.
GAME SCORES · SAVED IN THIS BROWSER
Explore the 12-level Fair Share 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. Make exactly 2 equal pieces with 1 straight cuts. Score at least 500 / 1000.
- Find your rhythm. Make exactly 2 equal pieces with 1 straight cuts. Score at least 550 / 1000.
- A little further. Make exactly 3 equal pieces with 2 straight cuts. Score at least 600 / 1000.
- Steady hands. Make exactly 3 equal pieces with 2 straight cuts. Score at least 650 / 1000.
- Keep it close. Make exactly 3 equal pieces with 2 straight cuts. Score at least 650 / 1000.
- New territory. Make exactly 3 equal pieces with 2 straight cuts. Score at least 700 / 1000.
- Stay focused. Make exactly 4 equal pieces with 3 straight cuts. Score at least 700 / 1000.
- Trust your eye. Make exactly 4 equal pieces with 3 straight cuts. Score at least 750 / 1000.
- The long way. Make exactly 4 equal pieces with 3 straight cuts. Score at least 750 / 1000.
- Fine margins. Make exactly 5 equal pieces with 4 straight cuts. Score at least 800 / 1000.
- Almost there. Make exactly 5 equal pieces with 4 straight cuts. Score at least 800 / 1000.
- Final challenge. Make exactly 6 equal pieces with 5 straight cuts. Score at least 850 / 1000.
QUESTIONS
Why does spacing cuts evenly not work?
Equal width is not equal area on a circle: a strip near the edge is thinner than it looks by area, and a strip through the middle is fatter than it looks. The exact equal-area spacing has to account for that curve, not just divide the diameter evenly.
What happens if my cuts cross each other?
Crossing lines may create extra pieces. You need exactly one piece per person; the wrong number scores zero. Empty or repeated cuts do not count, and you can undo your last cut before the final one.
Today’s challenge is waiting.
Resets at 00:00 UTC