Originally released in 2008, Castle Crashers is a terrific hack-and-slash side scroller that up to four players can play through together. While the four knights: red, blue, orange, and green are available from the start, all of Castle Crasher's other twenty-seven characters must be unlocked through either beating the game with specific characters or through various DLC. Each character has their own unique play style, and some are more effective than others.
Source：https://www.cbr.com/castle-crashers-best-characters-to-play/
