BP Night and demon world were released very close to each other and it is unknown which one was rated first. If demon world was rated first, BP Night was never a Top 1. We simply don't know.
Crimson Planet is often considered a Top 1 because it was #1 on the Demonlist after Zodiac got removed. However, Zodiac was never actually unrated, so Crimson Planet was never actually the hardest Demon in the game.
Correction: Apparently Zodiac was updated to a much easier level briefly after Xander confessed to hacking, so Crimson Planet WAS actually the hardest level in the game. It has been added (along with Amethyst and Thinking Space II).
BP Night is still grayed out for the reasons I mentioned.
Crimson Planet is often considered a Top 1 because it was #1 on the Demonlist after Zodiac got removed. However, Zodiac was never actually unrated, so Crimson Planet was never actually the hardest Demon in the game.
BP Night is still grayed out for the reasons I mentioned.