To easily kill any boss, equip the throwing knives and stand some distance away. Throw the knives as quickly as possible and you should deal a considerable amount of damage each time. Note: Olrox, Shaft, and Dracula will not go down as easily and Richter Belmont is immune to them.
To walk through a floor, equip two Heart Refreshes and a Duplicator. Start to jump through an open doorway and right before you go through use a Heart Refresh. Then, activate the second Heart Refresh. While the second Heart Refresh is activated, press the button for the first one repeatedly. You should start to go underground.
After using this trick, you can access a hidden save room. Go towards the drawbridge and you will fall into a hole that leads to an underground cavern. Go to the right to access the save room.
Note: This trick may only work with the "Start with 99 luck" code enabled. In the room before you encounter Death, there are three giant wolves called Wargs. Kill the first Warg them jump over the second one in the middle. Press Back and enter "Equipment". Remove the Dragon Helmet and Alucards Mail. Leave the Alucard Sword, Necklace of J, and Twilight Cloak equipped. Make sure Alucard is looking left. Allow the Warg to hit Alucard, and he should fly out of the room through the door on the right, then fly through across the room with Death into the next room. Do not enter that room until you defeat the first Bosses or after that.
When you arrive in the Inverted Castle, make sure you have the Shield Rod and the Alucard Shield. After acquiring these two items, go directly to the Clock Tower Rooms. Here you will find Guardians. They are a high level enemy but give out a large amount of experience points. Making sure your MP is full, equip the Rod and Shield, then press X + B activate the shield's power. It is now invulnerable. Walk into the Guardians with your shield. They will die instantly. Watch your magic meter. If you run out, hide in a safe area and repeat. If you are a level 28, you will reach level 61 within twenty minutes.
Use the "Walk through walls" glitch at the first area (the one with the drawbridge) and fall below the map. Go towards the drawbridge and you will fall into a hole leading to an underground cavern. There are only two ways to go; up, which leads back to the main floor, or right, which takes you to a glitched save point which does work.
To unlock Richter Belmont for play, save any game at one of the following points: after the final battle, into the middle section of the inverted castle, after defeating the final villain, and marked as "clear" with 180% or greater completion. Then, start a new game with the name RICHTER. Richter Belmont may now be controlled when the new game begins. Richter can not change forms or use armor, weapons, items, and magic. He can perform a super jump, a blade charging move, and use secondary weapons such as the throwing dagger, axe, and holy water.
Obtain a saved game file as described in the "Play as Richter Belmont" code. Start a new game with the name X-X!V''Q. Note: There are two apostrophes in the name. Game play will begin with luck set to 99.
Obtain a saved game file as described in the "Play as Richter Belmont" code. Start a new game with the name AXEARMOR. Game play will begin with the blue armor that transforms your character into the axe-wielding blue knight (Axe Lord).
After you enter the room, turn into Mist form and fly past him as he gets up. Hover on the wall behind him, just above the middle ledge. Wait for his attack to end then come out of Mist form as he finished Turning. You will land on the middle ledge and will be in perfect striking distance with his face. Repeatedly press [Attack]. Continue to hit him until Galamoth is dead.