Science on video games

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They are as important as you make them. I do not think these things are useful on their own; they are merely tools (if abstract ideas can be considered tools) to help you realize your ideas. Sorry, but I really don't think this is a worthwhile discussion. It'd be like asking: "how important is hydrogen in cooking?". The answer is "necessary" and nothing more because it is a useless and irrelevant question. All games use science, but that doesn't mean that many of them actually emphasize that fact. I place a higher emphasis on the aesthetics.