With the ‘Call of Duty’ series, came the highly popular Zombies mode and over the years the zombies in COD have become a serious force to reckon with, with gamers indulging in hours of gameplay to see off the threat in the arena, or simply stay alive as long as they can.

Now, Activision has revealed more details about the recently released Nuketown Zombies DLC. The studio and Activision have released a guide which shows how exactly the public matchmaking works in the game.

It has been stated that the entire algorithm of selecting proper games is based on the user’s ping. Sometimes the game places the user in a local match or in an international match where people are all from other countries irrespective of the ping, and the company has described as to why this happens.

One of the several steps includes filtering all games that can be joined by proximity to the player, which is done because Proximity does not stick strictly to city, state or country as seen on a map, and rather, it breaks down into four tiers of geographical region surrounding the player.

The query kicks off in the tier closest to the player and expands from there if it cannot find enough matches. Moreover, the query also ignores all full or “non-joinable” games, which could be half or more of the total available games in a playlist.

Another step talks about filtering broad skill range. What this step does is it takes the proximity-filtered list and constricts it further to the set of games that fall about roughly in the same broad skill range. This is a very baggy criteria in Public Match and is a broad-stroke filter that actually avoids games at the extreme ends. Thus, a player of very high skill should generally not get matched to games where the average skill of players is very low and vice versa.

As far as laggy gameplay is concerned, it could easily be because of the type of Internet connection the player possesses, and the guide also helps out in that area as well. While one of the problems arrive due to a low bandwidth to the internet due to ISP bandwidth limits, other problems include the likes of the user’s local home network having restrictive NAT settings.

Check out the full list on how the matchmaking works and why the gameplay is often laggy here