Santase (known as 66, Сантасе, Sixty-six or Sechsundsechzig) is a well-known card game in Bulgaria and also played in Germany.
It is a fast 6-card game for 2 players played with a deck of 24 cards consisting of the Ace, Ten, King, Queen, Jack and Nine.
https://github.com/NikolayIT/SantaseGameEngine/blob/master/Documentation/Rules.md
Wikipedia: https://en.wikipedia.org/wiki/Sixty-six_(card_game)
Bulgarian: https://bg.wikipedia.org/wiki/%D0%A1%D0%B0%D0%BD%D1%82%D0%B0%D1%81%D0%B5
The code in Santase.Logic library is unit tested with more than 250 tests and is 100% covered.
NuGet package: https://www.nuget.org/packages/SantaseGameEngine
Visual Studio 2015 is required in order for the code to be compiled correctly.