Most dominoes toppled by a group

According to Official Guinness Records,

On 13 November 2009, Domino Day 2009 saw the world record broken for the most dominoes toppled by a group, when 4,491,863 dominoes were toppled. A total of 89 builders set up the dominoes in the WTC Expo Center in Leeuwarden, Netherlands.

For a complete list of 2009 records, please visit 2009 Guinness Records in Netherlands.

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Other Netherlands records that might interest you:

• Heaviest marrow
• Largest parade of mopeds (motorcycles under 50cc)
• Most people treading water (multiple venues)
• Highest score on Galaxian (Namco, 1979)
• Largest bowl of soup