Secret Files: Tunguska for Nintendo DS is a point-and-click adventure game where players follow Nina Kalenkov as she investigates her scientist father's sudden disappearance, leading her and her companion Max on a globe-trotting quest linked to the mysterious 1908 Tunguska event in Siberia, uncovering a vast conspiracy involving secret societies and extraterrestrial clues, using stylus controls to solve puzzles across detailed locations from Germany to Antarctica