The rules of this game are very simple.  Choose one person or a team of people to be “it”.  This person must leave the room or cover their eyes.  When they can not see, the leader will then change one thing around.  Once done, It has 3 guesses as to what has changed.

This can be done in a variety of ways.  A table can be set up with a bunch of different items on it such as scissors, glue, makers, etc.  

Another version involved changing something on the teacher such as adding or removing glasses, switching your watch to a different hand, or taking your shoes off.  

Yet another variation involved the whole classroom.  Examples include having kids change locations, moving a poster from one wall to the other, or having kids exchange shoes. 

Use your imagination and change multiple things.  Keep in mind that in most cases, the younger the audience, the easier the change needs to be.