Unlock pictures in Secret File Mode:
Play Night Rider Mission Mode several times until you unlock all 45 pictures
Secret File Mode and Night Rider Mission Mode:
Keep playing the 3 Night Raider Training missions until all your stats reach the maximum level (try to get 100% several times in each mission)
Unlockables:
Dark Faust – Beat him in Nexus mode
Dark Mephisto – Beat him in Nexus mode
Dark Mephisto Zwei – Beat Survival mode with Dark Mephisto
Dark Zagi – Beat Survival mode with Ultraman Noa
Garuberos – Beat him in Nexus mode
Golgolem – Beat him in Nexus mode
Grantella – Beat him in Nexus mode
Nosferu – Beat him in Nexus mode
The One – Beat Survival mode with Ultraman The Next
Ultraman Anfans – Beat Survival mode with 10 characters
Ultraman Jeunes Blue – Beat Nexus mode letting the 2dn
Ultraman Noa – Beat Survival mode with 5 characters
Ultraman The Next – Beat Survival mode with Ultraman Jeunes
Deunamist – lose against Dark Mephisto Zwei and finishing this mode with the 3rd Deunamist