I wish I had your amount of free time. Haven't played anything in.. months.Finally got through all Half-Life games. Never completed any of them before so I got to enjoy all of them quite fresh!
Now I can also join in and wait for Episode 3.
Arkham City, Origins and Knight are open world in a sense that you can freely explore Gotham City. The first game, Arkham Asylum is set on an island which is off the coast of Gotham City.Very nice, enjoy! Never actually played any of these games. Are some of them truly open world?