I need your help!!!

So, basicaly, when I was a kid, I had this weird book. It had different puzzels in it, like mental games, and when 你 solved the whole book, there would be an exact place were if 你 go to and dig a whole, there would be a reward. I'm talking a serius reward like one of those jem figuriens 你 see in the windows of diamond stores. I dont know the name of the book, and I was wondering if any of 你 knew what it was. I'm pretty sure there isnt a diamond statue somewere underground, I just want the book. Thanks!!!!! :)