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For the first two or three months virtually all your money should go to power stations, satellite uplinks, and workshops, and your terror missions should gain you engineers or, if that isn't an option, cash. The basic strategy for Classic or Iron Man playthroughs is Satellite Rush - build them as fast as you can. Try to get EVERY other achievement during this first playthrough. Do this even if you already finished Enemy Unknown several times: the addition of meld, the covert missions, new enemies, new grenades, altered abilities, and other tweaks make the game different enough to throw your game off.
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You can use any other options you want, including Second Wave.įirst, you should finish Enemy Within at least once so you know the general gameplay. To get An Army of Four you need to successfully complete the final mission on Classic or Impossible difficulty without ever buying the Squad Size upgrade in the Officers Training School. I'm going to take a stab at this without writing a full walkthrough of the game, so please be kind with the -1s.
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