The following chapter of our Assassin's Creed Odyssey guide contains a list of all Ainigmata Ostraka (Ostracons) in the Malis location. In this location you will find only one puzzle: Heart and Sole.
Hearth and Sole
Location of Ainigmata Ostraka: House of Phyllidos, inside the building.
How to solve the riddle: Go to a small islet, that looks like a top of a rod and a lure. You will find the item near the rod.