Ah, yes, the challenge! The challenge.

ZGM is licensed under a Creative Commons free distribution license which means that you may freely share my work providing you neither change the content (very important, considering the puzzle!) nor profit from it without my prior consent. There is a catch, though: if you wish to compete in the challenge you must purchase a copy of my book from this weebly webpage via paypal for the incredibly low price of $1.99. 

And thus is the incentivization: the more people who purchase copies, the higher the stakes, the more exciting the cryptologic challenge becomes and the more money I earn to keep the happy little process going. Thus, if you like this book and want the challenge to be more meaningful, please help market it by spreading the word. I have chosen the full DIY publishing route, eschewing Amazon for a PayPal link and free webpage, so your help would be much appreciated!