[4] The Mystique Deck has been designed to use the same 4 suits (Suns, Moons, Arms, and Crowns), for compatibility with the Piecepack system.

[7] The piecepack is one of the base game systems included in Tabletop Simulator[8] and is also available as a module for the Vassal Engine.

[10] This is also a public domain expansion, which adds hexagonal tiles and triangular coins, using the same 4 suits as Piecepack.

They developed Hexpack as an expansion to extend the possibilities of the original modular system, introducing hexagonal pieces as an alternative to the square ones.

The reason for this expansion is to provide pieces to create games that involve roads, walls or similar elements.