Hacking is very simple and short and can be patched on any, even a modified version of the FDS or NES ROM.
The changes in this patch are aimed at reducing grinding in this game.
FDS
Block magic: 074B
Magic: 076F
Life: 0770
Sword level: 0773
Magic level: 0774
Life level: 0775
Magic use: 96FF
Magic block: 971F
Sword fly: A047
Magic+16 (070B) or Life+16 (070C): B552
NES
Block magic: 074A
Magic: 0773
Life: 0774
Sword level: 0777
Magic level: 0778
Life level: 0779
Magic use: 8DE4
Sword fly: 9847
Magic+16 (070C) or Life+16 (070D): E86A
FDS
1.1 Magic - 34FB: EA*20
1.2 Magic - 351B: EA*4
2 Sword - 3E4A: EA*16
3 Life+16 - 5358: 0C
NES
1.1 Magic - 0DF4: EA*20
1.2 Magic - 0E14: EA*4
2 Sword - 185E: EA*16
3 Life+16 - 01E87B: 0D
NES
Database match: Zelda II - The Adventure of Link (USA)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
File SHA-1: 353489A57F24A429572E76BD455BC51D821F7036
File CRC32: E3C788B0
ROM SHA-1: 11333ADB723A5975E0ECCA3AEE8F4747AA8D2D26
ROM CRC32: BA322865
FDS Eng
Database match: not found
Database: No-Intro: Famicom Disk System (v. 20180726-130152)
File/ROM SHA-1: CEF65267509A198C1E40F478A3F00C9216D51AE7
File/ROM CRC32: 359D3F2