Castlevania: The Dracula X Chronicles Cheats

In Stage 2, while the minotaur is chasing Richter, immediately fall into the first hole in the ground. You will not die, but instead be taken into the sewers. Play the level out normally and defeat the boss. Afterwards, you will be taken to Stage 3' (this is different from the normal Stage 3!).

In Stage 3', whenever the path branches, taken the upper route. Make sure you obtain the "axe" subweapon sometime during the stage. Eventually, you will meet a skeletal snake that is attached to a wall. Nearby is a vine-like cage; use the axe to cut it. It now serves as a platform for Richter to jump to the upper ledges. Continue along the upper ledges until you see a breakable tombstone. Inside is the item that unlocks Symphony of the Night. Return to the main menu to play it.

Go to stage 4.
On your way through twards the end of the stage you will find 6 of those skulls that spit fire stacked on top of each other. Just past them is a platform that moves like an inverted pengelium going left and right. Just opposite of it is a spiked ball. Get on the platform and jump over the spiked ball landing on the ground against the wall. Break the lower part of the wall to find a bomb. Hit the bomb to ingite it and the wall will come falling down.
Walk forward a bit and you will find 2 spiked platforms that try to crush you. Get on the right platform and as it's going up jump off of it and land on the upper level. Stay on top avoiding the axes and the yellow eye. At the very end of that platform is a candle hit it and inside will be some classic gaming goodness.

In Stage 2, while the minotaur is chasing Richter, there is a candlestick that contains the "key" subweapon. Make sure to get it, and then proceed down into the sewers after the minotaur is blocked by the wall. At the very end of the sewer path, there is a locked door. Use the key subweapon and it will unlock, giving you a cinematic scene where Maria joins Richter. She is now selectable as a playable character in the main menu.

The original game "Peke" was introduced in the original Chi No Rondo as a bonus game if you used the wrong System Card.

This is the third original game that can be unlocked.
First, you need to select NORMAL BOSS RUSH mode.
Beat it two times, you will receive two Sound Discs.
The third time fight until you defeat Shaft and defeat the next boss, at the end of the fight you should be rewarded with original game "Peke".
Access it from the main screen like the other original games.
I advice to use Maria and her Dragon sub-weapon to fastly defeat the bosses.

Defeat Death in Stage 5, then go to Alternate Stage 4 and defeat Camilla.