As these types are called nowadays. I have the GBA and DS Castlevanias and Metroids, and love them dearly. Also really enjoyed 'Monster Tale', and some of the DS Spider-Mans have been OK. I'd like to know about ANY and ALL of these games, please - ones with the open-ended, 'acquire new ability to reach new area' format. I'd prefer them to be 2D, but I'm open-minded. Thanks!