I don´t speak very understandable English, but I try to tell you something about it.
Some years ago I create some rules for a solo-playable Zombie game.
Solo playable means, that I want to play the humans, but there was nobody who want to play the Zombies.
So I create some rules for the Zombies to react ( if they hear noises / shooting or if they see some action, or a human comes to close to some markers )
After some test games the rules function very well.
In 2013 I let print the rules in softcover ( German language ) and in 2014 I made a "add on". In 2015 I collect all pictures and all test games in two books, and in 2015 we write a scenario.
In 2016 I stopped the Zombie theme and started other projects, but I want to have all 5 softcover books in 1 hardcover book for myself.
This is it.
I hope I found the right words.