From about 6 p.m., the zombies in the city will gradually appear and the number will increase rapidly, and even occasionally there will be one or two zombie dogs, when the "normal" level police in Koala City, the "elite" S.T.A.R.S. team (the U.S. Federal Security Department, Special Tactics and Rescue Team) and the "Raincoat" company U.B.C.S. team ("Raincoat" company special operations unit) will begin to fight the zombies in the city. If you want to complete a task of normal difficulty, as long as you change into a police uniform or show your strength during this time period, cooperate with these "thighs" and act safely, and complete the main quest of difficult or normal difficulty safely, the chance of success is very high. (Zombies: After being infected by the diluted T virus, the diseased cells are at war with the immune system, and the white blood cells attack the infected cells to cause a large area of human tissue necrosis, in order to repair the body tissues and restore the function of the immune system, a large amount of food and energy need to be supplemented, causing the infected person to have a strong appetite, the T virus greatly accelerates the rate of cell division and cell necrosis, because the human head has a "blood-brain barrier" system to protect brain tissue, if the barrier is not damaged, it has the opportunity to complete the mutation, Become a zombie that can walk upright and has foraging functions! Zombie dogs are similar. ）

At about ten o'clock in the evening, the ordinary police officers were basically killed, and the S.T.A.R.S. team will be divided and surrounded by a large number of zombies in several large closed buildings for tenacious struggle, at this time, the number of ordinary zombies in the city is basically saturated, zombie dogs will gradually appear but the number will not be too much, and the safety isolation door of the "ant nest" biological experiment located in the underground of the city will be destroyed, and a small number of "lickers" will appear in the city, If the contractor wants to complete the Nightmare difficulty, it is best to try to protect the combatants of their temporary squad before doing so, as every survivor gathering place will become a target for the "Lickers", as long as the members of the squad who are with the contractor still have some combat power to complete this task. (Licker: When ordinary zombies have sufficient nutrient supply, they will undergo deep mutations, the skin on the body will fall off, the muscle tissue will be strengthened rapidly, the brain cell death will no longer occur, the skull will disappear and the brain will be exposed, the vision will disappear, and the sense of hearing and smell will be abnormally developed)

At about 12 o'clock in the middle of the night, the senior management of the "raincoat" company launched the "Nemesis" plan, the main purpose of the plan is to test the latest B.O.W. (organic biological weapons), when the company's senior management learned that the Koala City spread the T virus, the first time they blocked the entire city, and under the dark box operation of various departments, the plan of experimental biological weapons was born, so the company's senior management led the research team to launch a "tracker" in Koala City at midnight, The main purpose is to rid the city of all living things, including uninfected humans. (Tracker: The Nemesis α parasite was created in the secret No. 6 laboratory of the "Raincoat" company, injected into the spinal cord of the test in the form of cells, and began to feed on the T virus on the test body to reorganize the host, changing the host's overall nervous system, and after entering the bone marrow, the host began to grow tentacles and penetrated through the whole body and even broke out, after the mutation is completed, it can innervate the brain to change the central circuit, the subject's thinking nerve is on the parasite, and the experimenter then controls the experimental subject through external control parasites, This B.O.W. occasionally has a tendency to rage, but is extremely powerful, can heal quickly from ordinary non-fatal injuries unless severely damaged, and has a certain IQ to be able to use heavy weapons. ）

Since about twelve o'clock, due to the intervention of "trackers" in the city, the number of zombies, zombie dogs, and lickers has gradually decreased, but the main mission goal of the trackers is to eliminate ordinary humans and powerful mutant creatures, at this time, the contractor must make a choice, whether to assist the "elite" team to kill the "trackers" or leave this world as soon as possible, it should be noted that the "trackers" are equipped with heavy weapons, including but not limited to: bazookas, small Gatlings, rotating machine guns, etc., "umbrellas" The company will also provide weapons and ammunition supplies to the "trackers" at any time, and this boss and the trash fish who only knew hand-to-hand combat before (yes, the unevolved lickers are also considered trash fish, which are slightly larger at best) are completely different concepts.

When the contractor with strong luck and strength kills the "tracker", he can choose to return immediately or delay the return, the general delay time is 10 minutes ~ 2 hours (depending on the difficulty of the contractor to complete 10 minutes, 30 minutes, 1 hour, 2 hours, after the completion of the god-level difficulty, you can choose to get a permanent stay time in the mission world!) ）

But! Yes, I'm going to say but! The above are all ordinary creatures, whether it is zombies, zombie dogs, lickers will mutate after devouring enough biological energy, and the type and intensity of their mutations are random, from "ordinary" level creatures will gradually mutate to "boss" level creatures! You must know that in this world, only in terms of creature level, the "trackers" equipped with heavy weapons are only "rare elite" level creatures, if the contractors have not dealt with the growing powerful mutant creatures, then in the end, the whole koala city will be a different scene! There are even some alternative contractors who conduct some terrible aberration experiments in this world, and the direction of this world will be confusing! (The level of creatures in quest worlds that appear in the third tier of worlds: Common - Rare - Elite - Rare Elite - Boss.) Creatures with the title "Rare" are stronger than their peers and slightly weaker than higher)

The main quest collection mode is relatively easy to understand, you only need to go to the place given in the quest bar to pick up the relevant quest items and put them in the contract space, theoretically speaking, if a lot of people team up to receive this quest, as long as you are lucky enough, you can collect it all within three hours of the opening game, and it is not impossible to clear the customs with hell difficulty.

And the difficulty of this task is time! Collecting quest items seems easy, but it is very difficult to complete the difficulty above the nightmare, with the increase of time, the number of zombies in the city almost doubles, and in the end it is almost impossible to move an inch, and in the later stage the quest items may even be hidden in a very ordinary zombie, it is not easy to find a zombie carrying the quest props in the vast corpse tide, and you must know that the quest prompt will only give the contractor the most basic information, and it is also an instant refresh position, If a zombie dog accidentally carries a quest item, then the contractor is ready to run around the city! Therefore, this task is prepared for peak contractors like the three brothers, and only they can get the rewards of difficult tasks.

The quest world is not a pickle game on the Internet, killing the enemy will "ding ding" the drop of equipment items and also intimately display the name, and there will be no one-click pickup of this ridiculous thing (pop pop), if you want to find the task props in the vast corpse tide, the only way is to kill a group of zombies and then search carefully one by one.

The Void Tree will integrate the number of people who receive the task and the strength when refreshing the task items, once it exceeds the range value set by the rules, then the refresh location of the task items to be collected by the contractor will not be limited to Koala City, the most likely is that the "ant nest" laboratory under the city will refresh the task items, and then if you want to complete the difficult task, you must give priority to finding all the task props in the city, and then collectively have an "ant nest" sweep, And the hidden quest of this world, or the hidden quest that can be triggered in a certain period of time, is in the "ant nest", and the target of this hidden quest is the first-order "boss" level boss, and this boss can be said to be one of the most powerful monsters in this mirror world at present, and its strength is very terrifying!

As for the main quest survival mode, it is very easy to understand, one word - Gou! At this moment, Absalom, Empty Dog Bubutni, Sashimi (if you know who these are, please smile!) Soul possession! You're not alone anymore! You're not alone!

Zero compared it with the other two tasks as soon as he saw the main quest for survival, combined with his speculation that the quests were interrelated, he chose the main quest for the new contractor almost instantly, although the collection and killing quest can collect more useful materials in the process of completing the quest, but the risk is also amazing, in comparison, the main survival quest is the least rewarding but the least risky, and you can only proceed to the next round alive! Zero chose to become a "Voldemort" without even thinking about it, and if his guess was right, the newcomer who chose this mission according to the principle of absolute fairness of the Void Tree would get more rewards than the other two missions.

Walking on the street in a hurry, Zero swept the prompt in the task bar It was already 17:03 in the afternoon, he had to rush to a place before a certain time period came, otherwise his mission this time might only end in difficult difficulty, and if he found that he had certain conditions to make some arrangements, the difficulty of completing Zero's world mission was at least at the nightmare level!

Just in the dark alley of only one street adjacent to the location where Zero quickly went to the target area, a teenager in the shadows seemed to raise his head consciously, and looked in the direction of the street where Zero was walking with half-squinted eyes, although his eyes were staring in that direction, his hands were not idle, and at his feet lay a uniformed policeman, at this time, the teenager was picking off the policeman's clothes and putting them aside, judging from the cold body of the man on the ground, he had been dead for a long time, The boy took off the clothes and immediately took them out again after putting them into the contract space, and began to take off his clothes, and after taking off his shirt, the contract imprint of the blue space was revealed in his heart!