The resource management game mainly takes place in the XCOM headquarters.

CNN: Two games in one in 'XCOM: Enemy Unknown'

As desirable as that is for the Shah Deniz II players, they need to remember the cardinal rules of the gas game: The ultimate resource holder, in this case Azerbaijan, always holds the aces.

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The developer also encouraged other designers to use the "community of game fans" as a resource.

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But he said his team tried developing a resource strategy-only game and a combat-only game, and both felt like they were missing something.

CNN: Two games in one in 'XCOM: Enemy Unknown'

Perhaps they believe that money also buys depth, a tremendous resource advantage in a long 162- game season, which in turn helps the team win.

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Oil is what economists call a "fugitive resource, " a thing, like water or wild game, that migrates where it wants and is difficult to own in any conventional sense.

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The wind-power lobby has won a potentially game-changing victory in its full-court press to unlock the vast offshore wind resource off the coast of North Carolina.

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Solomon said developing the combat portion of the game was fun from the very beginning, but that, for the longest time, the resource part wasn't.

CNN: Two games in one in 'XCOM: Enemy Unknown'

The soldiers really had no personal connection to the player in the resource portion and the mission rewards didn't mean as much in the combat game.

CNN: Two games in one in 'XCOM: Enemy Unknown'