If you're looking for a real-time strategy game, you should try StarCraft. It came out in 1998 and is rated T (for Teen). You can play it on PC, but, unfortunately, it's not available on Steam.
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{"name": "StarCraft", "release_year": "1998", "esrb": "T (for Teen)", "genres": "real-time strategy", "platforms": "PC", "available_on_steam": "no", "intention": "inform"}
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