Tombstone Engine

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The Tombstone Engine is the technology developed by Terathon Software
for the game The 31st.

Available for licensing on PlayStation 4, Windows, Mac, and Linux.

General Licensing Information
Upgrading from the C4 Engine
If you purchased a license to the C4 Engine any time in 2014 or 2015, then we will deduct whatever you previously paid from the cost of a new license to the Tombstone Engine. (In some cases, this means that you will be able to get the first version of the Tombstone Engine for free.) If you ever purchased a professional license to the C4 Engine, then you are eligible for a free license to Tombstone Engine 1.0.