Call of Duty's first ever Zombies mode, in Treyarch's World at War, still holds Easter Eggs no player has found.

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Talking to IGN, Treyarch's Director of Zombies, Jason Blundell said that there are "absolutely" still hidden surprises in every Zombies map so far, all the way back to the original mode."I was having a chat with someone," said Blundell, "and they were saying 'we've found them all!' and I went 'OK, well here's one then - have you looked at the bios for World at War?' That's now 6 years old, and there was a hidden message that was taking the first capital letter of every sentence in the bio, and it made a sentence. They'd already written it off and moved on - there is more of that kind of stuff throughout all the maps."Blundell explained that most of the strictly mechanical secrets had been found, but more elusive ideas - Easter Eggs requiring cryptography, for example - are still waiting to be spotted:"Sometimes people go about it literally with Easter Eggs - in other words, I'm going to press X on this and I'm going to do that - and a lot of those have been discovered, because it's the most obvious part, and once you start taking things apart they can look at it and go 'oh that's how you do it'. The Easter Eggs left on some of those earlier ones are now more spiritual-based ones, or kind of clues to things."Explaining that the team has entire design categories for Easter Eggs - classed as Light, Medium, Heavy and Impossible - Blundell also let slip one final bit of interesting information: "We have bets in the office on how long it's going to take [players] to get to the main Easter Eggs."Think of your help in cracking the codes as a service to some agitated developer, just waiting to win the big bucks.And a new search starts now - Black Ops 3's Eclipse DLC is out now on PS4, and includes the new Zetsubou No Shima Zombies map . Happy hunting.

Joe Skrebels is IGN's UK News Editor and his version of a Zombies Easter Egg is working out how to stay alive for more than six minutes in that damnable mode. Taunt him on Twitter