The Old Professor

The Old Professor Description:

The Old Professor is a Puzzle Games that you can play online on FreeGamesMart.com. It has been played 775 times. Published On Jul 04, 2016.
I finally did it. I discovered the formula for free, clean energy! But I forgot where I hid it. Can you come over and help me look?
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The Old Professor Instruction:

Use mouse to play this hidden objects and spot difference game.