I'll notify our data team on this. Thanks for reporting!

I can't seem to find any of the walking dead episode X games in telltale games' company games listing page either, though they do appear in a generic "the walking dead" games search, so I'll list some of the 404's I found:

http://www.gamespot.com/the-walking-dead-episode-1-a-new-day

http://www.gamespot.com/the-walking-dead-episode-2-starved-for-help

http://www.gamespot.com/the-walking-dead-episode-3-long-road-ahead

http://www.gamespot.com/the-walking-dead-episode-4-around-every-corner

http://www.gamespot.com/the-walking-dead-episode-5-no-time-left

http://www.gamespot.com/the-walking-dead-season-two-episode-four

However, this may well just be down to merging of them into 'series' pages, such as these 2 that work fine, and appear to include the reviews, etc for the aforementioned 'episodes' in the 'series':

http://www.gamespot.com/the-walking-dead-a-telltale-games-series/

http://www.gamespot.com/the-walking-dead-season-two/

In which case, there are 2 issues:

1 is that most of them don't appear in the quick-search (typing into the search bar and the list appearing, never having to press enter/return), which is the same as the watch dogs issue mentioned here. Simply pressing enter and going to the full search page sidesteps that issue for users.

The other is that several pages still appear in the search when they shouldn't, as they no longer appear to exist - at least not in a deployed/accessible to users manner.

Why not just simplify the way you edit your stack? Instead of having to go into "edit mode" by clicking on "edit this stack" just let me click a box to delete or move a game. It would be similar to how a Netflix queue is set up...or, heaven forbid, the way the site used to be...