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Concept - Metroidvania EDIT  

Overview

The Metroidvania style of gameplay focuses on free exploration of one large 2D world. It is so named as a portmanteau of "Metroid" and "Castlevania" as the style is largely attributed to Metroid on the NES and Super Metroid on the SNES, but was heavily borrowed and further proliferated by Castlevania: Symphony of the Night and its six similar portable sequels. Its origins, however, can be traced back to the game Brain Breaker, which was released prior to Metroid.

The game world in a Metroidvania game is designed in a non-linear fashion, allowing players to explore the world. However, there are usually limitations to a player's exploration, such as out-of-reach areas or areas blocked by an obstacle only destructible by a certain attack. Such limitations are subject to completing certain objectives or finding new tools, and backtracking to and revisiting older areas are hallmarks of this style of game. There are other free exploration designs besides the Metroidvania, and it could be argued that the original Legend of Zelda had an incredibly similar design mindset. The primary difference is the camera view. Most games that allow free exploration use a 3D or overhead (aka top-down) view. In the case of a Metroidvania game design, the layout is that of a sidescroller. In addition to being a sidescroller, it is the first game type that allowed the player to explore both right and left in addition to climbing upward and falling down.

When the Metroidvania style of play was created, it conflicted with a number of established video game concepts. For example, there were no longer any levels. Since the game was non-linear and allowed free exploration, levels ceased to exist. Instead, the game is broken up into areas, or worlds, that are all seamlessly connected. Each of these areas typically have a unique visual style and/or musical score to give the area definition. Scores were also taken out. This was replaced with speed running. Speed running focuses on the amount of time a game took to complete and how much was done (ex: percent of power-ups collected). This also popularized the 100% run. Players are encouraged to take up this run for unlockables and/or alternate endings. Another form of speed run takes the opposite approach and encourages the player to run through the game while collecting the absolute minimum number of power-ups required to complete the game.

The concepts of a single large world, free exploration, and the obstacle-powerup-backtrack cycle were re-created in polygonal 3D for Metroid Prime and its sequels. Though it may not technically be considered 100% adherent to the style, given its first-person viewpoint and polygonal 3D world, critics noted that this was a very successful transposition of the style's core tenets into a different environment.