A second edition of the Ninja Burger RPG was published as a PDF in March 2006, and is available in print through Key20 as of August, 2006 (ISBN 0-97931-960-9).

It uses an all new ruleset based on Atomic Sock Monkey Press' Prose Descriptive Qualities (PDQ) system.

The game features a campaign set in San Francisco, California, which is (according to the back story) the home of Ninja Burger Headquarters.

Like other games utilizing the PDQ system (including Dead Inside (DI); Monkey, Ninja, Pirate, Robot: the RPG (MNPR:RPG); and Truth & Justice (T&J)), Ninja Burger is notable for the flexibility and simplicity of its rule systems.

Player statistics are rated in five named ranks: Poor [-2], Average [+0], Good [+2], Expert [+4], and Master [+6].

It shares only the core concept with the Ninja Burger RPG, using a completely different set of rules and game mechanics designed and developed by Steve Jackson.

[2] A supplement to the card game entitled Sumo-Size Me was published in Spring, 2005 (ISBN 1-55634-741-3), and was also illustrated by Greg Hyland.

The Ninja Burger: Honorable Employee Handbook originally appeared as a self-published PDF through the website RPGNow, and was published in 2006 through Citadel Press (ISBN 0-8065-2796-X).

It includes material such as: Ninja Burger History, Fitness, Recipes, Safety Tips, Etiquette, Salary & Benefits, Health Coverage and the company's (literal) Termination policy.

Ninja Burger has also been referenced on other webcomic sites, including All About Eda,[3] Stalag 99,[4] Sam and Fuzzy[5] (coincidental, according to the author), Megatokyo, and Sluggy Freelance.

Though not directly influenced by it, Ninja Burger's concept is similar to a Saturday Night Live sketch from the late 1970s by John Belushi entitled "Samurai Delicatessen" In this skit, Belushi played a samurai working in a New York City deli who would commit seppuku if customers were unhappy with his sandwiches (which he prepared using his katana).

Other likely influences include Snow Crash, which features a ninja-like deliveryman named Hiro Protagonist who works for a Mafia pizzeria and would be assassinated if a delivery took longer than half an hour, and "A Fistful of Yen", a short parody of Enter the Dragon from Kentucky Fried Movie.

The first year's events were small, but in 2004 the holiday gained international support from a group of French performers, who staged elaborate ninja poses in front of famous landmarks (such as the Eiffel Tower).