Masterfully, you don't need to be playing as a perk to gain experience in it. One excellent part here is that as you gain experience with the different classes you'll level up, giving you more bonuses - every five levels you'll unlock an additional little perk - maybe an extra 50 HP or the ability to reload a little faster. On the other side of the coin, the Firebug has a flamethrower, plenty of fire-based weapons and the ability to thin out the crowds of weaker enemies. The classes focus on different things: the Berserker focusses on duelling the bigger monsters with melee weapons, with access to parries and lots of buffs to increase survivability. At the time of writing there are eight classes in Killing Floor 2, but seeing as this number has already basically doubled since Killing Floor 2 reached Steam's Early Access program last year, it wouldn't surprise me if we eventually saw a couple more. For a start, there's a meaningful progression system that encourages and rewards different play styles. It's probably one of the co-op titles of the year, or it would be, if Tripwire looked likely to ever release it. The comparisons between Killing Floor 2 and Left 4 Dead are obvious, but it's important to understand from the word 'go' that Killing Floor 2 isn't a scary game - it's an arcade game arena survival where there's nothing to fear as long as you've got a gun in your hand or allies at your side. After each wave you run to a 3D printer being remotely controlled by a nice French lady, and use the money you've earned from killing the gross creatures to buy new weapons, ammo and armour. This is the world of Killing Floor 2, sequel to Tripwire's original smash-hit co-op shooter, pitting you and your team of six against a bunch of science experiments gone wrong. In some situations, this total collapse of civilisation as we know it would be scary, but not for me: I've got a flamethrower.

The Eiffel Tower is doused in flames in the distance, the low guttural growl of zombies comes from the tunnel ahead of me.

Killing floor 2 flamethrower