This puzzle is accessed by clicking the Eye of Horus in the background of The Seventh House menu screen. It is unlocked after opening The Second Gateway.
This is a 12-part puzzle which involves moving a series of cards towards the edges or center of the screen, alternating direction for each part. Clicking a card will swap its position from center to edge (and vice-versa), as well as two other cards. Hovering over a card highlights which cards will be affected if it is clicked.