Please note that you must own Sniper: Ghost Warrior 2 in order to unlock the collector's edition content upgrade with this key.
Game Features:
• Tactical Intelligence. Enemy combatants are now tactically aware and much more unpredictable as they respond differently depending on the situation. So if you ever are discovered, expect everything from flanking movements to frontal assaults as the enemy tries to engage you in close quarters where your rifle is less effective.
• Enemy Behavior. In-game enemies vary their level of aggressiveness depending on the size of their unit. Pairs of sentries are more cautious then a platoon-size unit whose aggressiveness is much greater. Word to the wise: recon the area carefully before engaging.
• Real-World Ballistics: many factors impact the effectiveness of the sniper, and Sniper: Ghost Warrior 2 has included every single one, from wind direction to bullet-drop.
• Human Factors: as in real-life, it is critical for players to control their breathing; slow their heart rate and assume the proper skeletal position to successfully put lead on target.
• Spotter: the spotter is the Sniper’s most critical companion on the battlefield and a high level of coordination is key for completing the missions. In addition to the spotter calling out specific threats and suggested shot sequences, new joint missions require synchronized, simultaneous shots between the sniper and the spotter.
• Bullet Penetration: backed by the high-octane stopping power of the modern sniper round which can penetrate a variety of materials, you can now eliminate enemy combatants as they hide behind cover. Taking out multiple targets with a single round is possible and wait until you see it on the game’s Bullet Cam.
For those that are interested in the DLC and holding out for a better deal on the base game. Nothing is stopping you obtaining the code and then later redeeming it on Steam. Steam just doesn't allow you to add DLC codes for games you do not have