Yes. You should try it cause it is different from the other 2.
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You must defend just a city, not the whole world, and this is much harder and more cool. Another thing is that X-COM Apocalypse has a Real Time Strategy option and a Turned Based Game option. And this makes it more cool. I`l let you discover the other cool things of the game, but this if you only play it.
Come here daily cause I`l be here too (only if I don`t have a problem).