Which retail product design holds the Guinness World Record for 'Most Units Sold of a Construction Toy'?

The retail world has its own share of impressive world records that showcase extraordinary achievements in customer service, product design, and shopping experiences. These records not only highlight innovative thinking but also demonstrate how retailers push boundaries to create memorable consumer interactions. Test your knowledge about remarkable retail world records that have shaped consumer psychology and retail strategies globally.

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LEGO (over 400 billion elements produced since 1949)
Meccano (with its revolutionary modular metal design)
K'NEX (for its unique rod and connector system)
Mega Bloks (for pioneering large-scale building blocks)