Monster Mayhem: Build and Battle for the Nintendo Wii is an action-strategy game where players create and customize their own monsters. As the name suggests, it combines creature construction with combat gameplay. After crafting monstrous creations using various body parts and attributes, players then train and lead their creatures into battles against other monsters. The game boasts a family-friendly aesthetic with light-hearted graphics and easy-to-learn controls, making it suitable for players of all ages who enjoy monster-themed battles and creative gameplay.