2. DOTA 2
DOTA 2 originates from a Warcraft 3 mod called Defense of the Ancients, and sees players take on the roles of various heroes and villains on a field of battle where two sides, the Ancients and the Scourge, fight a perpetual war against each other. Each hero comes with its own set of skills and serves a specific utility in the game. With dozens of heroes to choose from, DOTA 2 can be a daunting experience to attempt to master, although it's very easy to get into.