Microsoft has revised its Xbox 360 Achievements rule book, agreeing to allow publishers to add an additional 250 Gamerscore points to disc-based games through add-on content. The content could be either free or paid. Xbox Live Arcade games can also receive a boost, as publishers are now allowed to add 50 additional points (to the required 200) via downloadable content, which could be similarly free or paid.
Each disc-based game must include 1,000 points that are accessible for free (excluding price paid to obtain game), but not necessarily included on the game disc; Crackdown, for example, will only ship with 900 unlockable points, while the remaining 100 will arrive built into a free content update. Microsoft admits that there have been "inconsistencies" in the past, but hopes that the new, supposedly clear policy will regulate publisher's Achievements.