Only one game... series.

[Pike]

oh god this is gonna be tough.

Leaning towards Warcraft. You get your MMOs and your RTS games all in one spot. Also maybe a card game if we're letting Hearthstone in.

Well, if we're counting DLCs and such there's also all the mods, like the original DotA.

Yep! Also the tower defense and golem madness style maps which were more fun than DotA but never got as popular.