Surprised it's been over a year since I've done this. But I guess that happens when you don't buy any new games for almost a year.

Costume Quest: Grubbins on Ice - This add-on to Costume Quest was roughly one third the length of the original game at one third of the price, which made it a nice way to extend the experience a little for fans. It takes place after the original and has a winter theme, though the gameplay is pretty much the same - you trick or treat until the area is clear, fight simple turn-based battles, find some collectible costumes and upgrades, and find stuff for people. The boss fight at the end was the most challenging encounter they've made so far, although it still wasn't terribly difficult. The ending teases more content on the way, though I suspect at this point it will be another stand-alone game rather than a small five dollar chunk.

Left 4 Dead 2: The Passing/The Sacrifice - Originally, the intention was to release The Passing for L4D2 and then The Sacrifice for L4D1, tying the two games together and killing off one of the original characters. The Sacrifice ended up also being released for L4D2 though, which allowed players of that game to play with the old characters using the equipment and enemy upgrades from the sequel, as well as starting the release of all the old content in the same way. So while the two campaigns are kind of short and don't add a whole terrible lot in terms of new twists on the series, they're still pretty fun and helped Valve experiment with new ways to roll stuff out to players. The online comic that preceded The Sacrifice's release was interesting as well.

Red Dead Redemption: Undead Nightmare - Pretty darn meaty for ten bucks, Undead Nightmare completely changes Red Dead from a western-themed shooter to a game all about scraping by against a horde of zombies. Ammo is limited, enemies charge at you in groups and only go down easily from headshots, and there isn't a lot of help to be found. You'll usually divide your time between doing missions to advance the lengthy and surprisingly funny story and rescuing and defending outposts from invasions, which is more fun than it sounds. Most DLC doesn't come close to changing the game as much as this one, and it's a lot of fun. There are a bunch of other supernatural extras like side jobs involving horses of the apocalypse and sasquatches. One of the best DLC packs for the money I've ever played.