Alternative missions:

  Bomb disposal mode - Difuse all bombs. The sound the bombs make may give you
      clues about their locations.
  Eliminate mode - Take out all enemies and get to the goal. You may knock them
      unconscious or tranquilize them instead of killing them
  Hold up mode - Hold up at enemies and get to the goal. The mission will be
      terminated if you are discovered.
  Photograph mode - Murder in the prison cell. Raiden has been killed. Take a
      photograph of the killer.

Bomb disposal mode Eliminate mode
Hold up mode Photograph mode