WHO PLAYS BATMAN SERIES TOO ?
Arkham fan here.
However, I need to point out that Arkham Origins isn’t part of the Arkham series. It’s confusing because it has a similar name. But Origins is made by a different developer than Asylum-City-Knight and Origins also doesn’t fit the same story arc as Asylum-City-Knight. For example some gadgets Batman readily uses in Origins are actually prototypes in Asylum-City-Knight and some of the villain first appearances in Origin don’t match up.
It’s called the “Arkham Trilogy” because there are three games in the series, not four.
But yes, they’re all awesome. Just don’t say Origins is part of the Arkham trilogy, you’ll end up offending some millennial comic book nerds to the point of tears.
Edit: Further reading for you - https://www.reddit.com/r/BatmanArkham/comments/2lvt0s/why_isnt_origins_part_of_the_the_series/