Books.
_Juggler of Worlds_, Larry Niven and Edward Lerner.
This book is incomprehensible unless you have digested the entirety of Known Space, up to about _The Ringworld Engineers_, and enjoyed the _Down in Flames_ scenario, and speculated about fanfic in Niven's universe... and are willing to accept that pretty much all of the Man-Kzin Wars books are noncanonical.
In other words, this is professionally written fanfic, of the "let's explain what happened through the eyes of a minor character" sort. Lerner's voice isn't quite Niven's, but it's good enough.
For completists who meet the above criteria only.
This book is incomprehensible unless you have digested the entirety of Known Space, up to about _The Ringworld Engineers_, and enjoyed the _Down in Flames_ scenario, and speculated about fanfic in Niven's universe... and are willing to accept that pretty much all of the Man-Kzin Wars books are noncanonical.
In other words, this is professionally written fanfic, of the "let's explain what happened through the eyes of a minor character" sort. Lerner's voice isn't quite Niven's, but it's good enough.
For completists who meet the above criteria only.