The orgernizers behind the LEGO extravaganza Brick Live have hidden 100 Lego keys in secret spots on the conveniently named Brick Lane (see what they did there).
Manage to get your master building claws on one you can trade it for free tickets for you and a friend to go to the show. The search starts at 12pm today, when the @legoshow Twitter account will begin posting clues using the hashtag #FinderKeepers, to help you find them.
