In 'Classic' mode you can't control the direction of your jump (like in old classic Castlevania), so it's much harder to play. Japanese version of the game (Dracula Densetsu ReBirth).
Castlevania Adventure ReBirth (WiiWare) - Full Playthrough (Normal+Classic). Castlevania: The Adventure ReBirth (ドラキュラ伝説 ReBirth, Dorakyura Densetsu: ReBirth, The Legend of Dracula ReBirth) was developed by M2, released by KONAMI for Wii console in 2009, as the third work in M2's ReBirth series (another two are Gradius ReBirth and Contra ReBirth). Castlevania: The Adventure ReBirth (ドラキュラ伝説 ReBirth, Dorakyura Densetsu Ribāsu, The Legend of Dracula ReBirth) is a side-scrolling action platform game developed by M2, and released by Konami for the Wii in 2009 as a WiiWare title.Based on the 1989 Game Boy title Castlevania: The Adventure, it is the third game in M2's ReBirth series, following Gradius ReBirth and Contra ReBirth.
