Co-Op

Dark Souls II: Scholar of the First Sin is a remastered release of Dark Souls II. Next to the main game with all patches it includes the three DLC packs:Dark Souls II: Crown of the Sunken King, Dark Souls II: Crown of the Old Iron King, Dark Souls II: Crown of the Ivory King
The gameplay has been slightly changed by removing certain safe zones and adding new NPCs and enemies, including the Forlorn. The placing of enemies have been changed to create a whole new game dynamic, specifically for returning players. Online and the campaign

Steel Storm: Burning Retribution is a top-down 3D Shooter (a chasecam view is unlockable) in which you control a hovertank to fight off extraterrestrial invaders with a good number of weapons. You have to succeed in various missions on many different maps by fighting any enemies you might encounter on the way, opening gates, collecting weapons, extras and points and blowing stuff up. The enemies include various sorts of defense towers and hovertanks.You can play multiplayer games in cooperative mode or deathmatch and capture the flag mode.

Tom Clancy's Rainbow Six Siege is an online tactical shooter video game developed by Ubisoft Montreal and published by Ubisoft. It was released worldwide for PlayStation 4, Windows, and Xbox One on December 1, 2015.
The game puts heavy emphasis on environmental destruction and cooperation between players. Each player assumes control of an attacker or a defender in different gameplay modes such as rescuing a hostage, defusing a bomb, and taking control of an objective within a room. (source: Wikipedia)

Everybody gets to be the big guy in this dynamic duo with a dissymmetry. Two codependent buddies use their accidental mass excess (and the cord it magically travels through) to bounce and rappel off of each other through treacherous levels where separation and a closing door mean instant death. Shiftlings features solo, local and online co-op puzzle-platforming over 5 planets, each comprised of 10 levels plus a bonus obstacle course. There's also a screen saver included, and a free demo is available. The one thing missing is a "puns off" switch for the in-game announcer.

Sonic the Hedgehog 4: Episode II is a 2D side-scrolling platformer reminiscent of the original Sonic games for the Sega Mega Drive/Genesis. It plays very similarly to the previous episode, but with several enhancements. Sonic is now accompanied by Tails, either controlled by the computer or a second player via local or online co-operative play.

Zombie Army Trilogy is a tactical first-person shooter based on Sniper Elite V2. It includes two spin-off standalone titles only available for PC: Sniper Elite: Nazi Zombie Army and Sniper Elite: Nazi Zombie Army 2. These two games were remastered and put into a single campaign with a new, third episode not available separately.

Resident Evil: Operation Raccoon City is a third-person shooter and is a spin-off of the long-running Resident Evil series. Unlike the main games in the series, it is less of a survival horror game and more of an action-packed shooter, also prompted by the involvement of Slant Six Games, known for its titles in the militaristic SOCOM series.