In CoD zombies you must complete tasks to unlock hidden easter eggs and lore for the map. One of the maps that I greatly enjoyed was Moon for Black ops one. Now what if Fire fight maps were just as dynamic and you unlocked secrets or easter eggs. Once you find the maps easter egg it would also give a secret code like how Halo 4 had when watching the terminals from Halo Ce anniversary. Each code gives you a piece of armor or a x of 5 codes. Each player has a unique code generated so players can’t just look up the codes. When the code is found the code is entered into the maps descriptionso you can just keep it for record keeping and you don’t have to redo it. When performing such tasks the game gets harder to the point where the last map is at a LASO difficulty (probably remove iron to make it more easier for players). When the final code is put in you get the full set of armor or a very, very, awesome set of coatings. Its an idea.
Would love some easter eggs you really have to dig for, COD is a great parallel for that