Sierra On-line has announced the release of You Don't Know Jack 5th Dementia. The game was developed by Jellyvision and brings multiplayer capabilities to the trivia game series. The latest rendition features new questions based on pop culture and a new question type, Bug Out. You Don't Know Jack 5th Dementia is a humorous trivia game that is played like a game show. The game is now available for a suggested retail price of US$29.99. For more information, visit the official You Don't Know Jack Web site.