According to Official Guinness Records,
The largest game of leapfrog involved 1,348 participants in an event organized at the Canterbury A&P Show (New Zealand) in Christchurch, New Zealand, on November 11, 2010. All participants were school children and the game lasted for 9 continuous minutes.
Chris Sheedy adjudicated.
For a complete list of 2010 records, please visit 2010 Guinness Records in New Zealand.