Each era presents different challenges, obstacles, worlds, weapons and health and armor, as well as friends and foes.
There are four playable eras:
- 1200 B.C, Athens, Greece - Filled with dangerous mystical creatures and powerful Greek gods, and packed with powerful ancient weapons from the ingenuity of the Greeks.
- 560 A.D, Norway - A town torn apart by plague and famine, ravaged by the living dead, and abundant with powerful magical items, and dangerous weapons of dark magic.
- 2030 C.E, San Francisco, United States - Plunged into martial law and in constant gang wars, San Francisco is the place to find dangerous weapons and armed foes.
- 2455 C.E, Kyoto, Japan - a dark future in which Kage Mishima controls the future, and the Mutagenic Marburg-Pox Filovirus runs rampant. The future is full of futuristic technology and cutting-edge weapons.