The game takes place during WWII Warsaw Uprising of 1944, showing it from a different perspective - that of an underground courier, braving the sewers under the war-torn Polish capital, in order to deliver crucial reports from Srodmiescie to Mokotow district.
On his way to the desired destination the 'sewer rat' has to face a series of trials , which require spatial awareness, dexterity and logical thinking. Avoiding or deactivating traps, sneaking under Nazi guarded manholes and finding a safe way in a deadly labyrinth of underground passages - all those provide a fair challenge and a memorable experience.
During the game the courier learns numerous historical facts relating to the Warsaw Uprising, finds period appropriate artifacts and gets to know the capital.