How to play
Move the balls, one at a time, until the pegs match the picture. The pegs hold three, two and one ball. Ten puzzles, each a little longer. Fewest moves scores most.
Tap a peg, then another · Or keys 1 2 3
Free in your browser, with ten levels that get harder. No account; your best scores stay on your device.
What the study found
Shallice built this puzzle to study planning: rearrange coloured balls on three pegs of different heights to match a picture, in as few moves as possible. People with damage to the front of the left side of the brain solved fewer of the puzzles. It is still one of the most widely used planning tasks in psychology.
Tim Shallice · Philosophical Transactions of the Royal Society B, 1982
Why it matters
Thinking a few moves ahead takes real effort, and every extra step makes it harder. KOZMO turns what keeps happening at work into evidence people can understand, prioritise and act on: one picture a whole team can work from.
It is for fun: the game does not measure you.
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