Red Dead Redemption's Undead multiplayer mode - 'Overrun' - is Nazi Zombies in the Read Dead world. We're not going to hide it, reveal it as some unexpected twist or try to find some deeper level to the whole idea. Conceptually, that's it.
Just like Nazi Zombies, Undead Overrun pits 2-4 players against increasing waves of relentless zombies in a game where the death of you and your friends is the inevitable end.
Rather than inhabiting and defending some dark, cold, derelict building players are free to roam the expanse of the Wild West, moving in and out of graveyards, buildings and fields in the fight against the undead.
What keeps players in roughly one area is the timed objective of getting to a freshly spawned coffin marked on the map, breaking it open to top up on ammo and then taking on the zombie horde that's crept out of the ground in the meantime.
Once you're finished in one spot it's a race to the next one where another coffin awaits and even more zombie seeds have been sown on the ground.
As with Nazi Zombies, cooperation is the key to survival but because you're working in the world of Red Dead with the rich third-person engine there are a few more tactical options available.
If you've already read our Undead Nightmare single player campaign preview (of course you have) then you'll be familiar with the new weapons you can expect to find in your holster during your zombie bashing adventure.
The basic set of rifles. shotguns and pistols will be your main companions and making use of Dead Eye is always recommended, although it's been dampened in terms of its killability (yes it's a word) compared to the single-player Undead Nightmare.
The Blunderbuss, again, provides a quick, one-shot kill but takes an age to stuff with zombie body parts before it can be fired in the first place.
In terms of the most effective way of killing a lot of zombies all at once, the Zombie Bait is where it's at, followed by a stick of dynamite while your less than lively friends are chowing down.
Remember, though, that ammunition is replenished by opening those coffins that are protected by ever-increasing, ever-vicious zombies. The team aspect, then, comes not only from shooting zombies who are getting on your mate's back and reviving friends downed by one to many clawed swipes to the face, but also in rationing ammo, bait and explosives as a group.
FIRE IN THE HOLE
Communication is essential, especially as resources start to dwindle, you'll be shouting to your fellow cowboys, calling for bait counts and directing dynamite aim once you've gathered zombies in one place with some bait of your own.
The feeling is altogether more immediately frantic than Nazi Zombies; where the early stages of COD's apocalypse were something of a formality but for the pant-wetting anticipation of what was to come, Undead Overrun slaps you right in there with the dead from the off.
The primary stages are a doddle, obviously, but with no walls or even distance to separate you from the enemy there's always the chance that sloppiness will get you into bother early on.
As you progress the loot in the coffins will give you new weapons as well as ammunition and there'll be enough zombies for you to rack up kill-streaks unlocking perks such as phosphorous bullets, which send victims up in blue flames.
There's also a wider variety of zombie as the waves increase: The bog standard "Undead" are only recently deceased and so are still in quite good nick, considering they've been residing six feet under with the worms. They are the "normals" - normal pace, normal resistance, normal attack damage if they manage bite you.