{"ref":"master","ref_type":"branch","master_branch":"master","description":"You're given 12 balls which all look the same. However, one of the balls  weights differently (either lighter or heavier). Your task is to identify  which ball is different and to tell whether it's heavier or lighter.  The only tool you've got is a balance scale, which you can use up to 3 times.  Only balls can be put on the scale cups.","pusher_type":"user"}