The True20 system was originally used in Green Ronin's Blue Rose,[1] itself based on their Mutants & Masterminds RPG.

[3] A revised softcover rulebook, combining the rules section of the True20 Adventure Roleplaying book with the True20 Companion was released in April 2008.

[1] In its generic role-playing game, the original hardcover printing of the True20 Adventure Roleplaying book included four sample settings.

These were chosen among publisher submitted setting with the winners announced in Dragon Magazine:[6] The Revised Edition offers sections on fantasy, apace, horror and modern adventures.

Details were posted on the company's website[14] and forums,[15] and met with praise from publishers, freelancers and players alike.