Start with one Jenga brick vertical, and construct the widest possible structure you can without any other bricks touching anything but other bricks.
Mid-September 2003 -
Andy Balaam - 6 and a bit bricks wide (accurate measurement will take
place if there is a rival contender).
Previous record: 6 bricks wide (18 inches) - Pete Beresford, Andy Balaam, Tim Lees, 28th June 2003.
5 blocks wide using giant jenga bricks:
6 bricks and a little 3 dimensionality - Colin Brearley 14th February 2004
5 bricks wide, but interesting ideas perhaps? - Andy Brown, Andy Balaam, 30th June 2003
Nice attempt, but you'll need to do better than that: Anna and Gemma June 2004