Counter-Strike: Global Offensive (CS: GO)

Counter-Strike: Global Offensive (CS: GO) is a first-person shooter video game, which is a part of the Counter-Strike series. It was announced to the public on August 12, 2011, and is developed by Valve Corporation and its partner, Hidden Path Entertainment. The game was later released on August 21, 2012 for the Playstation 3, Xbox 360, Microsoft Windows and OS X and Linux later as a downloadable title.
Counter-Strike: Global Offensive uses the latest version of the Source engine and is not built out of Counter-Strike: Source. After the success of the previous game, Valve wanted the younger set to suit both casual and competitive community, including a matchmaking system and support for dedicated servers.
There are 8 new weapons in the new Counter Strike, and there are several changes to weapons returning, for the firepower, rate of fire, accuracy and speed of movement. They keep the same basic attributes and are officially considered the "successor".
At the launch of the Global Offensive had a total of 16 official maps: 8 updated classic maps and 8 new maps for the Arsenal game mode.

This is a game you play online; even though you have to buy it, I think it's worth it!
Just try it and you will see that you will love it ;)

Game: League Of Legends, by Rafael

League of Legends is a MOBA (Massive Online Battleground Arena) developed and published by Riot Games. It was developed with the participation of Gabriel Sanchez, a former developer of Dota (Defense of the Ancients) and Steve "Pendragon" Mescon, former administrator of Dota map. The game was very well received with its format, free to play, a system that allows anyone to play without the need to pay, but with items that can be purchased with real money. It became the most played game in the world with about 1.3 billion hours logged by players in N.America and Europe, between July 2011 and June 2012.

The game was first announced on October 7, 2008, and released on October 27, 2009, remained in beta from April 10, 2009 until October 22, 2009, and was officially launched in Brazil on August 9 2012.

It is a very interesting game, I think.
Try it and tell me how it went ;)