You will need for each player (or Team):

• A different colored ball of sting or yarn
• A pencil
• A prize

Preparation: Tie the prize to the end of the string.  Hide the prize somewhere in the room.  Unwind the ball of string completely, passing over, under and around table legs, furniture and other objects in the room.  Tie a pencil on the remaining end of the string.  Repeat this with each ball of string, don't worry about crossing the strings; this will add to the fun.

To play: Give each boy (or team - could be a den) a pencil and tell him there is a prize at the end of the string.  Have them wind the string around the pencil as the work their way around the room to find the prize.