jonathan your right to become well aquainted with the stock game before modding.
not only will the stock game offer an easier learning experience, but it will help you develop a greater appreciation of the mod because you will see vast differences in the game and the mod.
I wouldnt go so far as to say GWX is "harder" but it is increadibly unforgiving of tactical carlessness or strategic neglect.
in other words, when using GWX, you will really have to think and act with all the "what ifs" in the back of your mind.
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