Alternate reality game - Wikipedia, the free encyclopedia
"The form is defined by intense player involvement with a story that takes place in real-time and evolves according to participants' responses, and characters that are actively controlled by the game's designers, as opposed to being controlled by artificial intelligence as in a computer or console video game. Players interact directly with characters in the game, solve plot-based challenges and puzzles, and often work together with a community to analyze the story and coordinate real-life and online activities. ARGs generally use multimedia, such as telephones, email and mail but rely on the Internet as the central binding medium."
On the differences between an ARG and RPGs or LARPS:
"The role of the puppetmaster in creating ARG narratives and the puppetmaster's relationship with an ARG's players bears a great deal of similarity to the role of a game master, gamemaster or referee in a role-playing game. However, the role of the players is quite different. Most ARGs do not have any fixed rules—players discover the rules and the boundaries of the game through trial and error—and do not require players to assume fictional identities or roleplay beyond feigning belief in the reality of the characters they interact with (even if games where players play 'themselves' are a long standing variant on the genre)."
Anyone remember a Michael Douglas movie called "The Game"? Sounds like that game would be called an ARG.
![Devious :] :]](http://www.enworld.org/forum/images/smilies/devious.png)
Every RPG game I've ever played was an alternate reality game.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.