The Battlefield series has contained a number of easter eggs, several of which took the community a long time to decipher and figure out, such as the Megalodon sea monster in Battlefield 4.
Today, players who've been experiencing the newly released Dragon Valley map, a remake of an older Battlefield 3 map, have discovered an easter egg that requires players to undertake a massive series of things to do in order to complete.
The Battlefield 4 easter egg begins by translating Morse code in Belarusian, before moving on to hidden object finding, logic puzzles, and even some audio editing. The easter egg isn't something you can easily repeat due to a certain degree of randomness and variation involved in the puzzles, so you'll have to figure some of this stuff out on your own if you decide to do it.
Why would you want to do it? Well, discovering and fully completing the easter egg challenge will unlock a special uniform for you to use in-game. This uniform was previously only available to members of the DICE development team.
If you're up to it, you can follow the video guide below by Jackfrags, who provides detailed instructions on at least some of the steps. The rest is up to you to figure out.