The 12 balls puzzle, also known as the twelve balls problem or weighing puzzle, is a classic logic puzzle where you must identify one odd ball among twelve using a balance scale in only three weighings.
Theme
Time0:00
How to play
Desktop: click a ball to select; click-and-drag to box-select.
Drag the selected balls onto the left or right scale.
Desktop: double-click a ball to mark it excluded (green).
Click "Weigh" to compare, then repeat up to three times.
Use "Undo" to revert the last weighing or "Clear scale" to reset placements.
When ready, enter your guess in the solution form.