An excellent compilation of two of the best-written (if not THE best) sci-fi Visual Novels out there. My only complaint about it is regarding how it's presented, mostly speaking of 999.

The usage of the Nintendo DS dual-screen as it was initially intended and how the writer managed to include the said feature to add to the story is lost in this remake, making the final twist of the game less impactful in its presentation. Besides that, the voice acting is great in both games (since the original 999 didn't get voice acting, it was a great addition personally) and the writing is top-tier, undoubtedly.