Create the bumper ball project. If you don't have a second power bit for later then at this point use a USB power bit instead.
creating your circit
Connect a power bit, a wire bit, and a BLE bit together to make your circuit.
Attaching your circut to the lego
Make an 8 stud x16 stud lego base to put your circut on.
Attach your circut to a lego adapter and then attach it to your lego base.
Score board creation
Make the score board by building up the lego in a funnel form around the light sensor.
Positioning your score board
Place your score board (what you built in step 4) at the back of your bumper ball project.
Set up your BLE bit
Go to bit controls and select "count up"
Turn on both circuts and select your BLE bit.
When you cover the sensor the number will go up.
Note: If you don't use it in a room with light it won't work.