This document proposes a new 3D password authentication scheme that combines multiple existing authentication methods into a 3D virtual environment to provide stronger security. It describes how a 3D password would be composed of a sequence of actions and interactions with various objects in the virtual world. This increases the complexity of guessing passwords compared to traditional text-based passwords. The document also analyzes the potential password key space, security advantages, and applications of the 3D password scheme for critical systems that require strong authentication.