Castlevania: The Dracula X Chronicles

To unlock BRN, beat the first boss on every stage (Wyvern, Werewolf, Minotaur, Dullahan, Death, Shaft, and L. Vampire).
To unlock Dash, beat the secondary boss on each stage (Serpent, B. Golem, Dogether, Carmilla, Hydra, Shaft, Shaft Ghost).
Beat every boss (including Dracula) to unlock Full boss rush

Go to Stage 4. Towards the end of the stage isan area where the lower section of a wall can be destroyed toreveal a bomb. Attack the bomb to destroy the rest of the wall.Enter the newly revealed area, go over the platforms, and killthe Axe Knights. At the end of this area is an item that unlocksthe original Dracula X: Rondo Of Blood.

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.