https://darkryoga.wordpress.com/2021/11/01/rom-hacking-personal-projects-parte-vii-dragon-fighter-dragon-hero-edition-nes/ is a hack of the US version of the game Dragon Fighter for the NES.
List of features, additions and changes:
1) Added new title screen.
2) Hard Mode of the game activated by default.
3) Double jump functionality has been implemented on the character.
4) The "Always Shoot Special Attack" functionality has been implemented in the character.
This patch can be applied directly on the Dragon Fighter (USA) / Dragon Fighter (U) rom!
https://www.youtube.com/watch?v=cNVRf8UAYiM
Database match: Dragon Fighter (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: E0A0363A899AD7DE696756B83036F8439FE35C4B
File CRC32: CCD575A1
ROM SHA-1: 6728C231090850C5B55E7954CC2BE8B45D4E5214
ROM CRC32: A166548F