This is a challenging activity for the student to correctly identify the specific substance, material or energy based on a set of clever hints. This activity could be used as an ice-breaker or broken up into 32 different warm-ups or any other similar use. The students can do this activity individually or in groups. You could use this as a fill-in exercise to stimulate the student's minds. Perhaps this activity could be used for those students that finish work early and are always asking to do something else.