Which one is different?

Ezra have been playing with the JumpStart program for a while now. His favorites are the puzzle and 'rubbish bin' (where he is suppose to collect the require items and put into the bin).

Today I realized that he was playing a spot the different one game. Somehow he seems to be clicking on the same one instead of the different one. So I try to explain to him what is different. The conversation goes something like this...

Dad: Son, there are four bears. How many are "green" ?

Ezra: 1...2....3 (and proceed to click on the "green" one)

Dad: WAIT! Don't click first. How many are "red"?

Ezra: 1.

Dad: Right! So the "red" one is different from the other 3 "green" ones. So you should click on the "red" one. (So Ezra proceed to click on the "red" one and it disappear)

Ezra: No more. *smiles*

Dad: Well done! Now you try the next one.
...

Finally understanding what he is suppose to do, Ezra proceed to correctly identified the different ones each time.

Another lesson learned.