WOW! Literally JUST read to final page, and I am still in shock! I literally just ended my favorite book series! I absolutely loved every single page of this book, Sky Key, and The Calling, along with Endgame Diaries and I'll even say I'm glad to have read Zero Line!This book along with all the other books have brought me through a bonding experience with every single character, as I spectate over all of their hardships, troubles and conflicts. Every action scene was great, every puzzle deciphering was clever, and every emotional rollercoaster in the book was convincing! This is by far the best adventure I've had while reading a book, because it truly is an adventure with reading it! Twelve diverse people from different places and cultures collide in the ultimate battle, and the plot teaches, even through the impossible, we Cavan all come together and help each other as one! The Rules of the Game was a turning point for the story that I started off not liking the idea of, but the way things unfolded made me like it. At first I was really hoping the series would end with a winner, but overtime in this book, I was actually routing for Hilal, Aisling, Shari and the others to stop it! This book really does reflect a lot of defiance against higher powers, such as our governments that we are enslaved under. Overall, I'm sad to see this series go, but I'm satisfied with the ending! Thank you Frey and Johnson for doing this, you really allowed a lot of fun for me and a lot of defiance against the real enemies. This series will not be one I forget