https://darkryoga.wordpress.com/2022/01/31/rom-hacking-personal-projects-parte-ix-operation-wolf-full-equip-marine-nes/ is a hack of the US version of the game Operation Wolf for the NES.
List of features, additions and changes:
1) Modification of the title screen of the game.
2) Now all the missions begins with more magazines available.
3) Now all the missions begins with more granades available.
4) Now the player takes less damage.
5) Now granades inflict more damage.
This patch can be applied directly on the Operation Wolf (USA) rom!
https://www.youtube.com/watch?v=szZ3DafzOjs
Database match: Operation Wolf (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 58A2D8FD7049C3B5582516633CA6A23A91291B9E
File CRC32: 80704705
ROM SHA-1: D77D9B89347510B852BAA83EA1C3E1EF41A1288E
ROM CRC32: EDC3662B