This is one of the WILY stagess from my second level pack, Megaman Adventure 2. Prior to the final version, all of the fortress stages were in need of improvements because I had grown to dislike them for different reasons. That is no longer the case. I think I have fixed these stages tremendously and they are a good challenge given your strong arsenal.

Stage Theme: Wily 2 (Snowy Ascension) - You have made it through the Molten underground passages, and now have reached a snowy castle range in the distance. The theme of this fortress was to have you feel like you a progressing towards Wily's Lair with each stage, as you will see them look interconnected. Additionally, one MM Adventure 1 boss can be found to unlock a power to help you.

Hidden Items: E-tank (Blizzard Attack required)
E-tank (Atomic Fire required)

More information, other level packs I've made, as well as boss weakness can be found on this post in the MMM Discord: https://discordapp.com/channels/328222878489247744/1175826323256643594