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25.05.2026 New claim submitted for Backwards Stair Climbing, 1 Hour 09.05.2026 New claim submitted for Mental Calculation, Division 09.05.2026 New claim submitted for Mental Calculation, Square Roots Keywords: (e.g football beer mat)	Listed below are the verified claims for the record listed. Ultra speed memory - Binary numbers - 2 seconds - Current world record 1. 56 Ramón Campayo (Spain) at the Mental Calculation World Cup on 1 July 2008 in Leipzig, Germany   Previous verified claims 1. 52 Ramón Campayo (Spain) on 4 November 2006 at the Impossibility Challenger Games in Dachau, Germany. 2. 50 Ramón Campayo (Spain) on 3 November 2006 at the Mental Calculation World Cup in Gießen, Germany 3. 46 Ramón Campayo (Spain) on 6 November 2005 in Dachau, Germany. 4. 43 Ramón Campayo (Spain) on 7 November 2004 in Starnberg     The Book of Alternative records - World records, record breakers and more!