Defeating the Balore
While fighting the Balore, when his hands go away and he starts the lasers, equip the Medusa Head Soul. This will allow you to freeze in mid-air, directly next to his eye. The fire from the laser will miss you. This way, you can smash away at his eye very easily until he is defeated.
Defeating Iron Golem
Use the Killer Mantle Soul. The Iron Golem will go down very easily.
Defeating red minotaurs
To defeat red minotaurs easily, equip the Killer Mantle Soul. This will kill them in one attack.
After defeating the Iron Golem, walk to the right wall and attack it with your sword to break it down. This reveals a passage to another room. In this next room you will find the Hippogriff ability.
After defeating Julius Belmont, you can enter the Chaotic Realm. About two save rooms inside the Chaotic Realm, there will be a place that resembles the area before you first fought the "Manticore". There will be a lamp that will always drop an enemy called Mimic which looks like a blue money bag. Mimic's Soul ability gives you money every time you get damaged. The amount of damage you get is the same amount of money you receive. Keep killing it to get its soul. Once you have Mimic's soul, go outside of Chaotic Realm and warp to "The Arena". Save and rest at the save room and equip the Mimic's soul. Go to the elevator and choose your torture room. The middle one is recommended as it is faster for you to lose life. Be sure to always visit the save room whenever your life is too low. Use this method to get the Soul Eater ring that costs 300,000 (allows you to acquire souls with ease). This is the best way to get fast money.
When you are in the Chaos Realm, equip your Roginus' Spear and the soul Erinys. When you encounter a Shadow Knight, kill him. You will gain roughly 3,300 experience points per kill. If you are near a door when you kill him, enter and exit to encounter the Shadow Knight again to keep getting experience.
When you get to the Chaotic Realm, go to the room where there is a Demon Lord and two Erinys. Keep killing them to get about 4200 experience points in this area. Also, there are coffins here. Hit the one on the upper right to always get 500 gold. Keep entering and exiting the room to repeat the process.
You need the weapons Death Scythe and Silver Gun for this trick. In hard mode when you encounter Graham, equip your Death Scythe in the first encounter with the soul Giant Bat. Keep hitting Graham with your scythe, use the Giant Bat soul when necessary to dodge his attacks. When he moves to the center and makes his meteors revolve around the room, equip the Silver Gun and move to the far right. This way, you will not get hurt. Keep shooting him until he goes down. When he goes to his ultimate mode, equip your scythe again and keep low, striking while holding [Down]. Slide when necessary to avoid the laser at the top. Killing Graham this way will result in minimal damage and a fast kill.
When you have the Fire Demon, Giant Bat, and Succubus souls equipped, you can shoot fireballs as a bat just like Alucard from Castlevania: Symphony Of The Night.
You must first obtain the Ability Soul from the Hippogryph. It allows you to perform a high jump if you press [R] while in mid-air. It is obtained very late in the game. There are some rooms in the castle that are immense and have high, hard to reach places. If you want to reach them without using the Giant Bat Soul, either alternate by pressing [A] to jump then [R] to shoot upward, or just continuously press [R]. This ability does not require magic, so your character can keep doing it forever.
When you are standing on the ground (or an enemy), instead of jumping then pressing [L] to use the Hippogryph/Hippogriff ability, you can simply hold [Up] then press [L]. You will perform a vertical jump reminiscent of the Lancers in the Final Fantasy series of games.
Attacking enemies above you
When you get the Hippogryph Soul (which allows you to do a super jump in mid-air), hit the bottom of something while still going upward to ram into it. If you do this when an enemy is above you, damage will be done to it. This is useful for attacking enemies with having to confront them.
Restore HP and MP
Whenever you talk to Mina, she will refill your HP and MP.
Transform into Dracula
Defeat Graham with the Flame Demon, Giant Bat, and Succubus souls equiped. When you defeat him, you will transform into Dracula. Note: There is a "Dracula's Tunic" in the next room.
Pass the large waterfall in the lower section of the castle
Equip the three God-like spirits (Curly, Devil, Manticore) which should be in the blue spirit section, also Undine in the orange section to stand on the water. Get enough distance between you and the waterfall then transform into the God form. If you gave it enough room, you will go through the waterfall, pick up the Armor, and enter a small new section of the castle.
Have 100% of all the souls, then go to the Chaotic Realm. At the room were you find the first Alastro (the invisible creature with the big sword), go to the room that is on the top left corner. You will find the Chaos Ring, which gives you unlimited MP while equipped.
Claimh Solais sword
To the left of the sunken ship in the Forbidden area is a room with a few fish heads that appears to be a dead end. Break down the wall to the left to gain access to a secret room. Inside is the Claimh Solais, one of the best swords in the game.
Once you have acquired the Giant Bat Soul, go into the lowest right torture room. Go all the way to the right and use the Giant Bat Soul to squeeze through the crack in the brick. In the next room is a ring called the Rare Ring. It has the same effect as the expensive Soul Eater Ring.
In the arena of the bath of Lilith and Sucubus, go up above the save point (the only one in the area ), then go right to see a toy duck.
Tsuchinoko can only be found in one room in the castle. It is the room to the left after the Golem Boss room. Keep entering and exiting the room until you see it lying on its tummy, and not digging. Note: The Tsuchinoko Soul is very useful; it gives you a big discount at the shop.
Double soul activation
Equipping the Bat and Giant Bat Souls simultaneously will activate both Souls when just one is used. In addition, if you do not have the Succubus Soul or the Flame Demon Soul, you can still do heavy damage, while looking for hidden areas and breakable walls.
Stronger Julius Belmont
If you are playing as Julius Belmont, you can increase your strength by collecting the floating object after defeating Bosses. He will grow stronger if you have 92.0-99.4% of the map completed. Note: When you fight Graham, instead of 84 damage per whip you will now do about 96 to 102.
Boss Rush items
Completed too slowly: Simple potion
Less than four minutes: Valmanway Sword
Four to-five minutes: Positron Rifle
Five to six minutes: Excalibur Sword
Completed quickly, but already had the items above: Simple potion