Pros:
+Great job on creating the scene of a plane-into-building crash cinematic, as well as the first map. +Custom writing decals. +Someone finally added people other than the L4D1 and L4D2 in a campaign! +Ability to loot bodies and create molotovs. +Custom Witch skin. +Entertaining in solo or co-op.
Cons:
-While the soldiers create another challenge for players and are new to the L4D series, it is vastly unoriginal for them to shoot the survivors. They also do not shoot any of the zombies, and zombies do not attack them, while this doesn't really make sense gameplay-wise, I understand it might be difficult for you to script them to shoot zombies/zombies to attack them. -The APC finale is extremely difficult, and I was playing on Normal. I still haven't beat it. -_- -When I played, EVERYTHING went after me, and any other human survivors. SI avoided the bots and went straight for me, including the Tank. Though I wouldn't doubt if this was just my luck.
Conclusion:
All in all, the campaign is nice and finally has people other than the game's survivors, and the campaign also slightly adds a more decision-making feel with the ability to make molotovs and loot bodies. The campaign is nice other than the listed cons, and I enjoyed it. If you want to try something new, give it a download.
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