Mass Effect 2

Mass Effect 2 is an action role-playing game developed by BioWare Edmonton, with assistance from BioWare Montreal, and published by Electronic Arts. The game is the sequel to Mass Effect, and was released on PC and Xbox 360 in North America and India on January 26, 2010, Australia on January 28, and Europe and New Zealand on January 29.

New features
A "Prelude to E3" developer diary was released on May 15, 2009. The developers confirmed that the combat system has been upgraded, with everything from the feel of the combat to the A.I. being improved, including realistic damage modeling and downed enemies still continuing to crawl and fight. New to the series is a heavy weapons system that will allow players to "kill [somebody] a thousand times" over. The tone of the game is similar to that of the Wild West, featuring warlords and crime gangs.

Mass Effect 2 also features regenerating health as its primary health mechanic, instead of the ability to heal with "medi-gel" as in the first game. However, "medi-gel" is still used to revive downed allies. In addition, weapons now use ammunition and no longer rely on the overheat system of the first game. This system is functionally identical to the ammunition systems of other third-person shooters, but instead of having differing ammunition types for different weapons, the heat sinks used are universal across most standard weapons.

The characters in Mass Effect 2 are more detailed not only graphically, but technically. In the original Mass Effect, Commander Shepard only had 20 animations for cover, while in Mass Effect 2, the character has over 200. The world is also more open-ended in this installment; uncharted worlds, of which the player could explore for "cheap thrills" in the first game, are now more detailed and include more to explore. The camera positioning for conversations with A.I. characters has also been improved; the previously static camera now moves around to provide "a much needed cinematic touch." Another new feature during conversations is a context-sensitive interrupt system: in addition to Renegade and Paragon dialogue options, Shepard is able to interrupt the dialogue when prompted to do so with on-screen controls, again along Paragon or Renegade paths.

The M35 Mako is not included for planetary exploration in Mass Effect 2 due to criticism of the Mako's poor gameplay sections in the first game. Instead, a Kodiak drop shuttle, which the player cannot directly pilot, transports the player to areas of immediate interest. A new pilotable vehicle called the Hammerhead will be released in a future downloadable content file and is stated by project director Casey Hudson to be more user-friendly.

Unlike Mass Effect, in which there were four weapon types, there are now nineteen different weapons, and the pistol has been broken up into the heavy pistol and the machine pistol. The grenades from the first game do not make a reappearance, but have been replaced by the new heavy weapons. Sub-machine guns make up another new weapon class. Characters are now able to use any weapon their class is trained for at full effect, meaning the player is no longer required or able to invest in weapon skills. Armor skills have also been removed and there are no longer class restrictions on armor. Instead, armor is controlled through purchases of upgrades or individual components and is applied piecemeal, with different armor components providing different bonuses to damage, health, and other skills.
Source : http://en.wikipedia.org/wiki/Mass_Effect_2