Super Mario Bros. is a platforming game for the Nintendo Entertainment System released in 1985. When Bowser invades the Mushroom Kingdom, it's up to Mario to stop him and save the Princess.

This is a Kaizo ROM hack of the original Super Mario Bros for the NES.
It contains 4 difficult levels that end with the standard Bowser boss fight.
This hack doesn't add anything new to the game but uses already existing assets to create interesting and new designs.
For example on 1-3 there are falling platforms placed on top of invisible blocks making it so that the player has a few frames to jump immediately otherwise they will clip into the block and fall to their deaths.
This ROM hack doesn't require the use of any type of glitch to complete.
Requires an IPS patcher

Database match: Super Mario Bros. (World)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
File CRC32: 3337EC46
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
ROM CRC32: D445F698