Tip: You can use Lunar Magic's Overworld Layer 3 Editing system to edit or create your own layer 3 images (castle bricks, fish, rocks) and apply unique effects per level via the Layer 3 Bypass in the main editor.
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Details for Kirby and the Amazing Mirror styled Enemy HP meter 2.0
SMW Patches - Kirby and the Amazing Mirror styled Enemy HP meter 2.0
It's working fine with vanilla enemies and the included custom sprite. It's a great addition, so the player knows how much hp the sprite has.
The patch comes with very detailed documentation, so it's easy to set up.
Also it needs full SA-1 support on the sprite and the RAM address (sprites can't access to RAM in banks $7E/$7F, so you have to use a free BW-RAM/I-RAM address). I'll remove the tag until something is done about that.