There is a bonus to bringing this type of world into TA: it provided an excuse to create underwater research gathering and floating defense structures. The first world visited is a pure water world, Hydross, with not a land mass in sight. Where Total Annihilation had metal, volcano, tropical, mars like, and earth like worlds - each with its potential to support land, sea, and air combat together - Total Annihilation Core Contingency forces battles on worlds where one or two of the three major unit types are ineffective or crippled. The environments tend to force the use of particular unit types. The single player campaign consists of the ARM Commander perpetually one step behind its Core counterpart as the latter treks across the star system in search of the galaxy-destroying artifact, and the multiplayer options reflect the new worlds visited by the single player campaign. The Total Annihilation Core Contingency disk updates the hard disk installation to include completely new world types and units. New Worlds, New Units, and More Annihilation. Hearing rumors of this plan, the ARM sends its victorious Commander unit to the distant system to investigate. The Core detected an artifact of immense power in this system, and realized that final victory could be had over its biologically based nemesis by using it to destroy the entire galaxy. Core, being a cognitive powerhouse, covertly dispatched a single Commander unit to lay dormant in a distant star system in case the low probability of an ARM victory were to come about. After repelling the Core assault on the ARM homeworld of Empyrrean, the ARM Commander used a chain of space folding “Galactic Gates” to take the war all the way to the Core homeworld: Core Prime, leading to the destruction of Core Central Consciousness and the last surviving Core Commander. The canonic ending to the original Total Annihilation story ends with the ARM achieving a final, dramatic victory against their mortal Core enemies. Total Annihilation Core Contingency: And You Thought the War Was Over.