Shortly: Expanded from the first game a bit but also slightly less accessible.

So if you are new to the series then start with watching game plays to understand that 'this is it'. No story no extra nothing, just slaughter. And you better be effective at it or else your wave streak is going to be short.

The first game is my recommendation to try if you like the game play to begin with. Also because that one is fine tuned just right.

In this installation enemy soldiers have slightly higher resistance to gunfire (or smaller hit boxes). Change is small but it's there. Some levels are so dark people with vision impairment are basically just blind to it. In some levels enemies can get into annoying cover positions and shoot at you from there and you can only return fire with select guns. Assuming you still have those guns active.

And the darkness: You really need to ensure you are playing in the dark as you cannot see anything sometimes. Darkness has always been an element but i don't recall being this 'in the dark' in the first game so be aware of this. It gets really annoying if you intend to play long wave streaks.

This game expands on the toys and battlefields you can take part in and it is a real treat. With the DLC in particular it's great fun. But it can also be a big waste of money for you if you are not into this so be aware what you are buying.

8/10