 43 hidden "ghosts" of people who worked on the game can be found by  taking pictures at specific locations. Some examples are:  Hideo Kojima (qv), Yoji Shinkawa (qv),  Tomokazu Fukushima (qv), Motoyuki Yoshioka (qv),  Scott Dolph (qv), So Toyota (qv), Yoshikazu Matsuhana (qv) and  Kazunobu Uehara (qv).