Hothead Games and Penny Arcade have announced that Penny Arcade Adventures: On the Rain-Slick Precipice of Darkness, Episode One, the first chapter of the planned episodic Penny Arcade Adventures game, will be available via Xbox LIVE Arcade this Wednesday. The first episode sends players to a deranged 1920s comic-book-meets-pulp-horror universe called New Arcadia. Armed with unconventional weaponry, players join forces with Gabe and Tycho of the Startling Developments Detective Agency to make war on bizarre enemies and solve the mysteries hidden deep in the sinister heart of New Arcadia. Five new screenshots have been inserted in our gallery.