Secret Files: Tunguska

The game is viewed from a third person perspective and uses a classic point and click interface. The game features a 'snoop key' tool, which highlights all interactive objects on screen and assists in finding small, easily overlooked objects. Unlike games in the Broken Sword series, however, it is not possible for the player to lose or get into an unwinnable situation. There are also a few parts of the game where players must switch between the main character, Nina Kalenkov, and her boyfriend Max Gruber, to progress.

The Wii version of the game exclusively allows the player to connect a Nunchuk to a Wii Remote and use its analog stick to directly control character movement and also supports cooperative multiplayer in which a second player uses another Wii Remote to easily point out anything that could be crucial to progress.

Nina Kalenkov is torn from her day-to-day routine when she discovers that her father has disappeared without a trace. As the police seem reluctant to help her, Nina sets off to look for clues relating to her father's whereabouts. She joins efforts with Max Gruber, a young colleague of her father who impulsively offers to help the attractive young lady. Together, they quickly determine that Nina's father was involved with a research expedition to Siberia in an attempt to reveal the causes of the mysterious Tunguska catastrophe of 1908. In that mysterious event, a mighty explosion triggered an inferno that decimated the land of Tunguska. Nina and Max soon realize that her father's disappearance is related to the Tunguska event and the search for answers leads Nina and Max to the most remote corners of the world – Berlin, Moscow, Cuba, China, and the Antarctic. Powerful adversaries are also interested in Nina's father's secret. In the end, much more is at stake than just the disappearance of an old man.

Tunguska was first released on personal computers in 2006 and was ported to smartphones and as many as four Nintendo gaming systems in the years that followed. The first ports were to seventh-generation Nintendo platforms, the Wii and DS, which Deep Silver announced the following year, stating:

"We chose to do it for a couple of reasons. Firstly to explore the control methods of the Wii and DS, which we find very interesting, and secondly because we feel the platforms deserve this kind of game."

Additional work was commissioned to capitalize on both systems' motion controls.[4] Those ports were first released in Europe in 2008 ahead of the sequel's initial PC release, but would not be localized for North America until Aeropause Games released them there in the summer of 2010.[5] The game was ported again digitally to mobile devices and the Wii U in the mid-2010s (the latter being available only in Europe), followed by a Nintendo Switch port worldwide in 2018.

Secret Files: Tunguska received "mixed or average" reviews, according to review aggregator Metacritic.[6][8][7][9] with praise given to the game's visuals,[16] and criticism given to the script and dialogue.

The nonsensical nature of some of the puzzle solutions has also been a point of criticism. Brett Todd of Gamespot called out one particular solution that involves taping a cell phone to a cat to eavesdrop on someone as something "goofy".[12] In his praiseworthy review of the DS point-and-click game Hotel Dusk: Room 215, Alex Navarro cited this same Tunguska scene as an example of what Hotel does well in avoiding.[17]

A sequel, Secret Files 2: Puritas Cordis, was released in 2008 on most of the same platforms as the original game.

• Secret Files: Tunguska at MobyGames