PSI Challenge Markers are items spread around Whispering Rock Psychic Summer Camp that increase Razputin's PSI Cadet Rank by one rank in Psychonauts. They are an amalgam of nine PSI Cards and a PSI Core.
The Challenge Markers are large, golden eye balls that have nine PSI Cards flying around them. They float in the air and the eyes blink and stare at Razputin. The markers are scattered around the camp, in areas that require skill or a new move in order to reach. PSI Cores are only available at the camp store and must be bought; they cannot be found. PSI Cards are scattered around the camp and even at the Asylum. They may be out in the open, but most of them require searching and new powers to find.