Both players together must create a third stone. One player has a board with a table (screen below), on which you need to create a stone, and entries around which the components are shown and named.
On the table, these components are indicated as abbreviations.
The second player must decrypt these abbreviations since he has a book with decryptions. Also, in the room of the second player, there are components with images. And three devices.
One combines two components into one, the second disconnect one component into two, and the third is needed to connect the three components indicated below the table’s stone (OH, OT, PF).