Halloween-themed RPG Costume Quest, the first in an unlinked series of downloadable titles from Double Fine Productions, will be released on PSN and Xbox LIVE Arcade on October 20.

Double Fine president Tim Schafer revealed on Twitter that the game will cost $15, which we assume will translate to 1200 MS Points on Xbox 360.

No idea what Costume Quest is all about? Check out our recent hands-on preview.