Finally, compiling all the processed sentences into the final formatted text with the syntax for synonyms. Once done, I'll ensure there are no remaining words that need synonyms and that all proper nouns are preserved. This should meet the user's request accurately.

ROMHacking: A well-known site for recalling retro digital play cartridges, covering Halo 2600. AtariAge: A collaborative website for Atari enthusiasts, showcasing updates, assessments, and acquisitions. Internet Archive

I need to ensure that no proper nouns are altered. The user emphasized keeping brand names intact. So "Halo 2600", "ROMHacking", "AtariAge", "Internet Archive" should remain as they are. Also, check that all other words except these are replaced with three synonyms each, maintaining the correct sentence structure. I'll have to go through each line carefully, perhaps word by word, to avoid missing any. Also, watch for words that might have multiple meanings and ensure the synonyms make sense in context. For example, "existence" in the context of the game's creation would require synonyms that fit that narrative. Lastly, verify that the formatting uses the correct braces and the pipes for the variants. Once done, double-check the entire output for any oversight or formatting errors.