From back of book Riddle Rooms #3 - Past, Present, and Future contains 20 illustrated encounters each posing a riddle or challenge. Some are deceptively simple; others are fiendishly complex. The rooms con be places in fantasy, modern, or futuristic settings, and some in all three. Riddle Rooms #3 can be used with any role-playing system. The rooms are designed for you to add to your adventures.