Tempus Mortem is a single-player game originally built in survival on Season 5 of Zedcraft, Zedaph's patron server. This version has only been updated a small amount to work better as a standalone map.
It is a puzzle game where the goal is essentially to learn how it works and get to the inside. Think of it more as a very large puzzle box. It includes many rooms that can (and should) be explored in any order and do not need to be solved sequentially.
There is no serious parkour and you won't be chased by monsters, so it's just you against the building. Most players take around 3-4 hours to complete this game.
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