"updated graphics, soundtracks, and gameplay mechanics" → modernized appearances, scores, and ruleset.

"update" → patch?

I also need to make sure that the spintax brackets are correctly placed around each term. Proper nouns like "FRONT MISSION 1st", "Forever Entertainment", and "Square Enix" remain unchanged.

Then the bullet points. "Improved Graphics": "Graphics" can stay as a single word but if it's part of a title, maybe? Here, it's in bold, so probably part of the game's feature, but the user's instruction says to rework all words with three alternatives. So "Improved Graphics" is the title, but "improved" and "Graphics" are words to replace. Wait, the user said "Proper nouns stay. Only output text." So "Improved Graphics" is a title, but since it's in the text as a section heading, do I treat "Graphics" as a proper noun? Probably not. So replace "improved" with "enhanced|upgraded|optimized" and "Graphics" with "Visuals|Renderings|Imagery."