Castlevania: Aria of Sorrow adds many new features to the series to make it radically different form the previous titles. The story takes place in the near future 2035, and the hero is a high school student named Soma Cruz, who was about to witness the fist solar eclipse of the 21 century, and suddenly passed out, and found himself inside a mysterious castle after awaken.
During the adventure you can collect and wield multiple weapons, and you can also acquire the soul of the enemies to gain over 100 powerful new attacks and skills. It is also possible to trade enemy souls with friends over the link cable.
Highly recommended! This is my my favourite Castlevania for GBA. This part introduces brilliant soul catch-use-and-collect system to the series (that is continued in Castlevania: Dawn of Sorrow for Nintendo DS).
It doesn't take much time to complete the game if you are familiar with Castlevania series, but completing it once is just the beginning of the fun. Unlocking three different endings, unlocking 100% castle map, collecting all souls and items, as well as completing the HARD MODE, JULIUS MODE and BOSS RUSH takes a lot of time. In other words: the replayability of the game is great.