Many games fuse platform game fundamentals with elements of action-adventure games, such as The Legend of Zelda, or with elements of RPGs. Typically these elements include the ability to explore an area freely, with access to new areas granted by either gaining new abilities or using inventory items. Many 2D games in the Metroid and Castlevania franchises are among the most popular games of this sort, and so games that take this type of approach are often labeled as "Metroidvania" games.[22] Castlevania: Symphony of the Night popularized this approach in the Castlevania series.[23] Other examples of such games include Wonder Boy III: The Dragon's Trap, Tails Adventure, Cave Story, Mega Man ZX, Shadow Complex, DuckTales: Remastered, Hollow Knight, and Ori and the Blind Forest.[24][25][26][27][28][29]