Castlevania 3 Revision
Alucard
3 Way Fireball shot is less spread out.
Fireball damage increased 2->3 US patch.
Bat form costs less hearts US patch only.
Grant
Throwing Dagger damage increased 4->6 US patch, lowered 2->1 JP patch.
Trevor
Throwing Dagger damage increased 4->6 US patch, 2->3 JP patch.
Holy Water damage lowered 3->2 US patch only. This puts it's damage on par with the JP version.
Syfa
Ice spell can damage bosses now 4 damage in US patch, 3 damage in JP patch.
Changed and or moved a few Subweapon drops so it's closer to the Japanese version for the US patch.
The Alucard FireballX2 patch just doubles Alucard damage and changes nothing else for the people who asked for that patch.
Improvement Patches
Improvement patch applies all optional patches for either the US or Japanese rom.
Swap between, and start with all 4 characters.
Faster animations for swapping between characters.
Reduced Knockback.
Points start counting down as soon as you pick up the crystal after beating the boss.
Faster animations for entering doors US version only.
Remove all monster drops including subweapons US version only.
Drop old subweapon on new subweapon piuckup US version only.
Added optional patch for US Castlevania 3 Kind and fair lowers damage to 2, 2, 3 for Trevor/Alucard, and 3, 3, 4 for Grant/Sypha. Lowered Axe Knight, Bone Pillar, and Bone Dragon life bars to Japanese/Europe values.