Downloading Cytadela 1.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program lies within Games, more precisely Action. This free Mac application is a product of Tomasz Kaźmierczak.
From the developer:
Cytadela is a single player game in which the player fights against AI enemies. The goal of the game is to find six bomb parts with which the Citadel has to be blown up. To achieve it, the player not only has to defend himsefl against the enemies, but (s)he also has to solve many riddles, such as swithcing apropriate buttons in order to open some door, move some walls, etc.
You may want to check out more software for Mac, such as Descent 3, Eternal X or Treasure Seekers 3- Follow the Ghosts, which might be similar to Cytadela.