In pre-war Poznań, a German spy network operates, transmitting secret information to the Reich. In order to detect the spy, Polish cryptologists and agents of the 'two' try to decipher the intercepted information and determine the meeting place of the agents.
The game takes place on the map of interwar Poznań, in which the training center for Polish codebreakers was located. By visiting special locations, players collect more tokens, attributes and hints helpful in deciphering the message.
The objective of the German part of the game is to make a meeting between an agent and a spy to exchange information and then leave the city without being caught by any Polish agent.
The most important element of the game is breaking an encrypted message prepared on the basis of one of the simplest ciphers - the Caesar cipher. However, without knowing the keyword, it can be quite a challenge.
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