What is in the mystery box on Nancy drew trail of the twister

I read that theres a sooner game and if u go to the 4th lvl and u click 1 tile u get a lot of pa pennies

Actually, there is a kind of snow globe with metal "tornadoes" spinning in it instead of some kind of "snow" thing.
Also, you get a coin from the jackrabbit thing, which gives you the hidden Easter egg and another star at the end of the game.