Zombie Princess: My Favorite Mechanism

About Zombie Princess, from BoardGameGeek:

In Rebel Princess, the princesses fought off unwarranted marriage proposals from pesky princes. Twenty-eight days later, the princes returned...as zombies! The zombie horde is growing. It began with the princes, but it has spread to the local villagers, the adorable woodland creatures, and even our noble knights! The rebel princesses are the last of us. If they fail, the kingdom will fall forever into darkness - a true and horrific Zombieland! Zombie Princess is the sequel to Rebel Princess. Just as Rebel Princess was a thoughtful modern spin on the classic trick-taking card game Hearts, Zombie Princess is a spin on the classic trick-taking card game Spades. As legendary princesses in Zombie Princess, players compete individually or as teams! Each princess is armed with a unique player power, giving her or her teammate much needed flexibility or information. Zombie Princess takes place over four rounds, and each round has a special rule, making each game feel fresh and unique. Princesses bid on how many hordes of zombies they will eliminate... er... save each round. Will you eradicate the resident evil of the land, or will this be the dawn of the dead? -description from the publisher