"The Enigma of Leonardo" becomes even more interesting and fun by adding cards from the expansion pack "Novem". This way you'll have nine cards in the form of a square 3x3 instead of five. This way you can get a key by having three equal cards horizontally, vertically or diagonally. When playing with the expansion, you'll need nine keys in order to win. Some cards in the expansion have 3 symbols on one card. Others may have text, these are action cards. They allow a player to replace more than one card, destroy opponents' cards, get new cards and Keys, and protect your cards from your opponent and to break your opponents' defense.