One of the most influential games of the 2000s was Defense of the Ancients. Usually abbreviated as Dota, it's akin to real-time strategy in appearance. However, it forgoes vast armies in favor of individual heroes. Players control those heroes as they assault or support various points on a map, often through a wide array of spells and other techniques. The mix of strategy and arcade-style adrenaline has drawn countless fans, virtually creating the whole MOBA genre. That said, such popularity also draws copycats.