Most concurrent players in one Minecraft world

According to Official Guinness Records,

Minecraft isn't really designed for supporting hundreds of players in a world at once, so when the popular YouTube Minecraft-specializing channel Yogscast squeezed 2,622 players together on 1 August 2011, it was hardly playable. But they were all together nonetheless.

For a complete list of 2011 records, please visit 2011 Guinness Records in United Kingdom.

Other United Kingdom records that might interest you:

• Largest collection of matchbox labels
• Longest distance run three-legged in 12 hours
• Most music festivals visited in 30 days
• Longest chain of people licking ice cream
• Largest parade of Jaguar cars
• Most expensive cricket bat
• Largest collection of pig-related items
• Longest distance marathon pool rescue
• Longest red carpet for a film premiere
• Most expensive wall calendar sold at an auction