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The tower, which measures some 31.9 meters in height, took a team of 4000 children to build and uses some 500,000 bricks.
It begins with a cross formation at the base for stability, and tapers towards the peak, where the final pieces were added with the aid of a hammer to ensure the tower was even.
In a nail-biting finish, Crown Prince Frederick of Denmark, Lego's original homeland, ascended the tower on a hydraulic platform to press the last brick into place.
The event was scheduled to mark the 80th birthday of the children's favorite -- since its conception by Danish carpenter Ole Kirk Christiansen in 1932, Lego has become a worldwide phenomenon, with 36 billion bricks produced every year (around 1,140 a second).
The Seoul tower now stands as the tallest Lego structure ever made, having overtaken a tower in France which measured 31.6 meters, although given that the record has been broken some 30 times, it may not be long before it's toppled again.
