In this paper, a direct general specification for simulating an entire universe would be given. The simulation would be targeted as same as maximally having physical considerations in reality.

Background: By identifying the universal attributes of basic attributes in an universe, scientific proposition of creating simulated universe could be derived.

Methods: By extending the Monty Hall Problem derived from the result of P vs NP Problem and Game Theory to the understanding of a single observation, the continuum of total observation events creates a distribution of probability which could be translated into distribution of possibility. And using from what has been defined in this universe, methods of utilizing simulation of reality could be described.

Results: Technical specification for creating axiomatic universe in existing universe could be described.

Conclusions: In generalized terms, simulated universe could exist with a customized reality.