Alucard can hover in the air for a second or two more by assuming mist-form. While mist may not last as long as you need for some attacks on hard difficulty, you can use mist to stay in the air longer than a few other characters (without relying on a particular skill or weapon) by using mist-form correctly.

To make Jonathan or Charlotte dance, hold UP for about seven seconds.

To unlock Japanese voices, hold RT and press A when selecting a character.

Pre-set food items slightly increase your character's stats when consumed at full (or nearly full) health, but only last until your character gets another food item or you finish the current stage (i.e. the food's stats bonus is only temporary).

Unlock the following gamerpics by performing the corresponding tasks:

GAMERPIC - HOW TO UNLOCK
Alucard Gamerpic - Complete Chapter 6 under the Normal difficulty setting in a single-player offline game.
Soma Gamerpic - Complete Chapter 6 in single-player mode as Soma.

Successfully complete Chapter 4 under the Normal difficulty setting. Note: More items and weapons in the shop will also be unlocked.

You can use your partner to reach high platforms. Simply perform a jump kick off of a partner's head while they are remaining still. You will get extra height from the bounce. Note: Charlotte cannot jump kick.

Don't destroy all the pillars of bone in a stage as you can step on top of them to use them as ledges and reach higher places. You need a minimum of two or three skulls to reach high areas and most characters can clear four skull-high towers.

Every player can only carry one Water of Life. Once you have a bottle in your possession, any other bottles you take will not count. Thus, allow another player to take the revive potion from the blue chest instead.

ACHIEVEMENT - HOW TO UNLOCK
Lifeguard (10 points) - Bring a comrade back from the dead.
Slick Kick (10 points) - Defeat a boss using sliding.
Bone Cold Justice (10 points) - Defeat an enemy by hitting back a Skeleton's bone.
Grim Synergy (10 points) - Defeat a boss using a Dual Crush.
Poetic Justice (15 points) - Defeat an ally who has been seduced by the enemy.
Vampire Hunter (15 points) - Destroy the lord of Castlevania.
Grasshopper (20 points) - Jump kick 30 times in a row without touching the ground.
Boned (20 points) - Defeat a boss with 5 players in skeleton form.
Pack Rat (20 points) - Collect 300 different types of items.
Wicked Deep Pockets (20 points) - Amass 1,000,000 gold.
Slaughtervania (20 points) - Rack up 10,000 enemy kills.
Hunter Legend (30 points) - Complete Hard Mode.

Collect the following items in the corresponding locations to gain points. Note: The items will not appear in you inventory.

ITEM - LOCATION
Chapter 1 Bell - In the room with the three bells, slide underneath the lowest one. Jump up into it and the bell will drop down to your left.
Chapter 2 Crown - Hit the following keys on the piano (counting from the right) - 5 white, 5 black, 6 white, 5 white, 2 black, 5 white, 5 black, 6 black.
Chapter 3 Moai - Wake the Boss and let him clear the room. Then, jump kick through the center of the vortex in the background and the Moai will appear there.
Chapter 4 Goemon - Find the a small dark alcove jutting out of the wall at the right side of the level. Enter it and the Goemon will appear to your left.
Chapter 5 Vic Viper - Enter the top right corner of the right building and tap Up. Vic Viper will fly across above the building from the right.
Chapter 6 Konami Man - Jump up next to the blue roof before the final staircase and tap Up. Konami Man will fly in from the right and just above you. Chapter 7 Vick13 - Go to the top of the pyramid, then jump.

When playing with others, any player that is killed and turned into skeletons are liabilities. If skeleton players die, multiple minutes are docked from EACH of their deaths.Also, if you are turned into a skeleton and no one revives you, don't hamper your team by dying. Instead, stay away from the boss and other sources of damage.

In single-player mode, the appearance of the clock hands will change depending on the system time. In multi-player mode, their appearance is dependent on the system time of the hosting player. The clock hands will be either solid or ghostly. Between the hours of two to four, and eight to ten, the clock hands will appear solid and can be used as ledges to reach other areas. Between the hours of ten to two and four to eight, the clock hands will appear ghostly.

Unlike other weapons, Alucard's Heaven Sword can only do a magic strike (DOWN, TOWARDS, ATTACK) when a second Heaven Sword is equipped. The Heaven Sword is located inside the boss' gold chest in Chapter 3, Normal.