Apparently, the games weren't compatible with iOS9 and Telltale decided to pull those games from the store.
http://www.pocketgamer.co.uk/r/iPad/The+Walking+Dead:+The+Game/news.asp?c=67776
Removed games:
It seems however, that they are still in you download history, at least for now. If you own them - I think you should back them up with iTunes.
EDIT: It seems like some of the games are removed from purchase history (as was with EA games case, Bioshock and Ghost Trick). If you didn't backup them, you're out of luck.
EDIT 2: It looks like there are plans to fix them and rerelease them.
Remove if old.
http://www.pocketgamer.co.uk/r/iPad/The+Walking+Dead:+The+Game/news.asp?c=67776
Removed games:
You can no longer buy Back to the Future, the Hector trilogy, Jurassic Park, Law & Order Legacies, Tales of Monkey Island, Poker Night 2, both Puzzle Agent games, Sam and Max, The Wolf Among Us, and both seasons of The Walking Dead.
It seems however, that they are still in you download history, at least for now. If you own them - I think you should back them up with iTunes.
EDIT: It seems like some of the games are removed from purchase history (as was with EA games case, Bioshock and Ghost Trick). If you didn't backup them, you're out of luck.
Puzzle Agent 1 and 2 are no longer in my purchased list on iPad.
EDIT 2: It looks like there are plans to fix them and rerelease them.
Sounds like they are planning to bring them back once the iOS9 issues are fixed :
https://support.telltalegames.com/h...und-the-game-crashes-after-I-updated-to-iOS-9
Remove if old.