These seem to be weekly deals. Make sure to pick up an Xbox controller if you don't have one. I haven't played AC yet, just AA. It is a strange, but exhilarating, sensation tackling armed opponents without firearms - I am used to military style 1st person shooters.
Probably unnecessary, but for completeness: "Batman: Arkham City builds upon the intense, atmospheric foundation of Batman: Arkham Asylum, sending players flying through the expansive Arkham City - five times larger than the game world in Batman: Arkham Asylum - the new maximum security "home" for all of Gotham City's thugs, gangsters and insane criminal masterminds. Featuring an incredible Rogues Gallery of Gotham City's most dangerous criminals including Catwoman, The Joker, The Riddler, Two-Face, Harley Quinn, The Penguin, Mr. Freeze and many others, the game allows players to genuinely experience what it feels like to be The Dark Knight delivering justice on the streets of Gotham City.
Batman: Arkham City - Game of the Year Edition includes the following DLC: Catwoman Pack, Nightwing Bundle Pack, Robin Bundle Pack, Harley Quinn’s Revenge, Challenge Map Pack and Arkham City Skins Pack.
Batman: Arkham City - Game of the Year Edition packages new gameplay content, seven maps, three playable characters, and 12 skins beyond the original retail release:
- Maps: Wayne Manor, Main Hall, Freight Train, Black Mask, The Joker's Carnival, Iceberg Long, and Batcave
- Playable Characters: Catwoman, Robin and Nightwing
- Skins: 1970s Batsuit, Year One Batman, The Dark Knight Returns, Earth One Batman, Batman Beyond Batman, Animated Batman, Sinestro Corps Batman, Long Halloween Catwoman, Animated Catwoman, Animated Robin, Red Robin and Animated Nightwing"
Also available: 75% off Stardock titles
Just a heads up, both of these games have just (in the last half hour or so) had patches that remove their GFWL and Securom DRM entirely. No more activation limits or GFWL headaches. And Arkham Asylum now has Steam Achievements, too (City already had them).
Even better, if you owned the non-GOTY version of either game, you should find that you've been given the GOTY version for free. Check your Steam games list.