The download contains 2 different patches designed for the roms identified as "good" by the No-Intro set and the GoodGBA set.
Information on the GoodGBA version of the rom: Metroid - Zero Mission (U) [!] SHA1: 5DE8536AFE1F0078EE6FE1089F890E8C7AA0A6E8 MD5: EBBCE58109988B6DA61EBB06C7A432D5
Information on the No-Intro version of the rom: Metroid - Zero Mission (USA) SHA1: 912A13C8F4D03724E4EF235765440C7A131CCAE2 MD5: 1FF19802B28F60357BA0629C26B9AEDF
Hack description
This is a hack of Metroid: Zero Mission that removes the exploration element of Metroid to focus on the boss combat. The game begins in a series of hallways where Samus can collect any and all of her power-ups. Following this are 3 different paths that lead to the 3 different ways you can fight the bosses.
Fight all the bosses in sequence without any opportunity to heal
Fight all the bosses in sequence with the option to heal between each fight
Fight the bosses in (almost) any order you choose
More information on the features and quirks of this hack can be found in the readme.
This was originally created primarily for use on Arcade Pit, the online retro gaming game show. Sadly, Metroid and Metroidvanias were deemed poor fits for the show, and as such this hack does not appear on there. Now it merely exists for people who want to try out the bosses of Zero Mission in their own self imposed challenges.
Check out more about Arcade Pit at https://www.twitch.tv/arcadepit