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???? (Tairyou Zetsumetsu) is a Japanese game of Mass Extinction.

Trilobites have been prosperous for approximately 300 million years from the early Cambrian to the end of Permian, but the time is coming that they are about to die out. They have survived many times of extinction events and following changes of ecosystem by evolving into various forms. Though having survived through Cambrian, Ordovician, Devonian periods, they are eradicated in the End-Permian extinction.

Mass Extinction is a game with a theme of survival and evolution of trilobites. They will be rewarded each time they survive a catastrophic event. Even death of an individual might trigger an evolution for the species.

With the doomed future ahead, which species will enjoy the most prosperous ending?

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