Lego's branded kits — such as the Star Wars packs — which come with instructions, hamper children's creativity, researchers say.
Scientists in Norway gave children kits with step-by-step instructions while others were left to build what they wanted. Both groups were later given other creative tasks.
Those who had no instructions with the Lego outperformed the other group in the creativity tests, the study found.
Co-author Marit Gundersen Engeset said: "What we find is that a well-defined problem — in our case, following an explicit set of instructions to build something with Lego — can actually hamper creativity in solving future problems."
She and Page Moreau of Wisconsin University published their findings in the Journal of Market Research, writing that Lego that comes with instructions is like "Googling [the answer to] a problem instead of getting it from your memory".