It's you against the evil Mother Brain in the thrilling battle of Metroid! You're inside the fortress planet Zebes. The planet of endless secret passageways where the Metroid are multiplying. Left alone the Metroid are harmless. But in the wrong hands they could destroy the galaxy. It's up to you to prevent the Mother Brain that controls Zebes from using the Metroid for evil purposes. But that won't be easy. You'll have to use your spacesuit to absorb valuable energy for your search to gain the use of power items like the Ice Beam, Wave Beam, High Jump Boots and Varia. If you survive, it will be you and your acquired powers against the Mother Brain.

From the author:
"This is a 100% complete patch: Most of the map was totally deleted so the game was built again from scratch. Items are moved, puzzles are changed, and there is no such thing as a dead end. It is hard both mentally and physically, but I avoided such design flaws as having to bomb arbitrary points in the floor or placing enemies so that you get smacked in the face on the way in or out of rooms. Metroid fans should love this! It's essentially a brand new NES Metroid game. Also, minor text and graphics hacks were done, but mostly just for packaging purposes, (As in, the title screen was changed, mostly). If you like Metroid at all, you should pick this up!"

This is a really fun hack, give it a try.

Metroid (U) (PRG0) [!].nes
CRC32: A2C89CB9
MD5: D77C8053168DA14B360BF5CAECCC5964
SHA-1: ECF39EC5A33E6A6F832F03E8FFC61C5D53F4F90B
SHA-256: E6E6B7014685ADAE447EBB3833242815747BC1E5DF83ADE79F693FB67CF565B6