以下是一些值得提前了解的提示，包括工具使用技巧。

This is some things that I found out that was good to know early. I hope to include mechanics on the tools that the game doesn't tell you, but without ruining the gameplay of using them. I am not going to go over each symptom as there is already a guide for that. I am going to try to minimize symptom naming to avoid spoilers as I am not trying to create a walkthrough and still get a good experience of the game, This is to add tips, strategies, and note some things that are not mentioned in game. Guide Summary These are things that I found and would have been been nice to know earlier. I hope to include mechanics on the tools that the game doesn't tell you. I based this around campaign and most symptoms that I do mention were given my default. I can't say they are there by default in Endless mode, but I am going to assume that most of the mechanics are the same. The first part will be a combination of mix of tips, I tried to group related topic ones together. The second part will be about the tools and some of the things that they don't tell you. So like said, this is not intended to be a walkthrough or tell you how to play the game. I want to let you still have fun, not be a spoiler, and solve the symptoms for yourself or use a separate guide if you want all of the symptoms. Mix of Tips and Mechanics I am going to go down a list of tips and some not told mechanics in the game. These are some Misc tip. Although I tried to group common or related next to each other. Almost always keep your flash light on has it helps in most cases. In the Symptoms tap, there is a small tab bar above the symptom list that will jump you to the symptom tool category rather than needing to scroll. When diagnosing someone, always go and try to mark down all of the symptoms even if you can tell that they are infected right away. Getting a perfect diagnosis of all symptoms gets you 9 Research Points or RP as that game labels them. I originally saw red eyes and sent them straight to Liquidations aka Execution without marking that or any other symptoms. So I missed a lot of RP to start with. The Stethoscope Color Indicator upgrade is good too as tell the good and neutral can be tough, but I would reach max tier first as this only affects one condition rather than multiple like the scanner and you get the scanner early. While on RP, I suggest avoid getting any side upgraded and try to focus on increasing your Zone Level. The only exception is the Clear View upgrade for the Scanner. It is easy to miss or misdiagnose symptoms due to direct or blood. I consider most of the other convenience upgrades. Zone Level also effects what upgrades you can due to your base. Survivors that have the Angry symptom and no other that designate that they are infect. You can automatically tell if they were infected as they will turn around and attack you when sent to Quarantine. If they do not attack, they have been a normal Survivor from my experience. Learn the difference between Red Bruises and Necrosis as Necrosis is when the skin is black. It does not match the picture that they give you. While on your Base menu, only upgrade as needed or what will help you save money, generator excluded though. Each upgrade adds the need for more energy. So more energy used the more fuel needed which cost money. I suggest checking the need base supplies at the end of each day and always try to keep fuel full. As you add more survivors during the day, the food and med pack requirements will have gone up, Survivors in Quarantine don't appear to require food or medicine for the day. In the Lab mini-game, you can zap on Red Organ without failing. Sometimes taking that hit will allow you to Extract the Target Organ. If you are not fully sure on the diagnosis and are not afraid to loose a survivor, you can take them to the lab. If you kill a survivor, you will not get the $1000 penalty, but get the $400 reward if it was an infected. From what I can see; if it is not evacuation day and you don't want to go too far over your limits for max Survivors in the Camp, you can do the above Lab or Quarantine to avoid any loss penalty for dead Survivors. The restart day function can be exploited to help diagnose the infected or not. If you quarantine anyone the previous day, you can recheck in the morning. Some of the Survivors will have gained symptoms while other may have lost some. Although some may not show any change. If you want to use and exploit and ignore this and be sure, just sent all quarantined Survivors to Liquidation or just shoot them yourself once you have a gun. If they were infected you will gain money; if not, you will loose money. Just restart the day and you will know who is and who isn't infected as it does not change. The Survivors waiting in line for Diagnosis will not be the same if you restart. The exploit is there unless they patch it, it is your choice to use or not. If you want a little extra money, you can kill rats for $25. You can crouch and hit them with a hammer if you can get close enough or you can just shoot them when you get a gun. I may not be much but it can be something done on the side. Plus it is an Achievement on Steam to kill 30 if that matter to you. You can also go to the Garage and shoot zombies over the wall for $75 if they are there. On Evacuation day, you can go over the Survivor support limit without worry about the limit penalties as they will be evacuated and the calculation only occurs when you sleep. Just make sure they aren't infected. When evacing, always meet your quota on the right first before sending other for the research points. When doing this you only get points at certain thresholds, which is like every 5. So if you can't meet either threshold, you can tell them to go back to the camp and save them for the next evac. This does come at the cost of needing to feed them, but this will help you possibly reach additional thresholds at the next evac or give yourself some extra to meet your next quota. Try to always have a Caged Infected on Evacuation day. That is an extra $2000. Don't forget to feed them each day though. In the Distribution tab, you can find an image of the current survivor and some of their information. This includes their Name, Sex, Age, Address, and sometimes a bit of background on them. This information will need to be referenced to complete some Directives. In the Distribution, their picture there can also be used to help see if they have some symptoms such as the Pale Skin Symptom. I don't know if the following 2 things are bugs or not. It doesn't seem that all Directives that you receive are possible to complete. One example is that you are assigned the Directive to kill 3 Infected outside the walls. There was not always 3 infected outside available to shoot. Per comments below, some of those zombies get glitched inside the base. Per recent updates, this Paragraph may become out dated. There are some survivors that have these white blotches on their skin. These are apparently not symptoms. I have sent them to the Lab multiple times. Per the comments, this is vitiligo. Tips for the Tools This section will go through tips related to the specific tools that are not obvious or things to think about to start with. I will try not to mention any conditions outside of what is automatically given to you. Thermopulsometer This one is pretty straight forward. The game mentions it, but if there Pulse it between 120-180 and they have hic ups or sneezing, it may just be a cold if there are no other symptoms. Above 180, they are infected. I would not get them upgrade for this until you reach max research tier as it is a convenience. Hammer This is a simple one as the other conditions are obvious. The Absent Reflex is not hard as long has you use the hammer toward the hand, If you hit too high on the arm, it will look like an Absent Reflex condition rather than good. Scanner This will probably be your most used tool as this helps you review their appearance. As this lets you see through their clothes for any hidden conditions. As sometimes they have mud or blood on them, they can hide or confuse you with a condition, the upgrade mentioned as the best will help with that hardship. Survivors will also have Tattoos under their clothes, don't get those mixed up with conditions. A easy mistake is to not scan their shoes, I have found bites there. The key is to learn what each condition looks like. Luggage Search This can be a tough one in some cases as you got to learn what counts as contraband by looks as it does not tell you what something is when you point at it. Weapons are those most obvious, but syringes are also contraband. You will need to learn bullet boxes from candy boxes. As it states any Infected parts means that they go to Liquidation, just remember to do a diagnosis first for the RP points. Stethoscope The Stethoscope has a mixed difficulty. When you pull it out and you see no black spot on front or back, you can easily tell that they are healthy. As mentioned above, the Sick and Neutral are close and can be hard to tell apart, but Infected stands out. Rapid Test Syringe The Syringe is straight forward and answers whether they are Infect or Not right away. Only use when necessary as they are limited. Even if used, I suggest try to get them diagnosed as much as possible. If you get all of the conditions, you will still get RP when you choose what to do with them. Although you probably wouldn't use it unless you were unsure anyways. Gun Well this one is pretty straight forward and I mentioned its uses and exploit above. My main note is to not shoot until after you tell them to got to Quarantine/Liquidation. You will miss out on the RP points for proper diagnosis. Also as mentioned above, you can shoot rats or Infected outside the walls for target practice if you want to shoot something. If you are suicidal, you can also kill guards, but others will kill you. X-Ray Scanner This can be an easy yet hard one. The game symptom screen only shows you the picture of the looks of a single organ. The symptom relates to any organ that has that look to it, even the brain. Funny since they are holding their stomachs. Also to note that multiple organs can have different symptoms. I had one person who had one organ that fell under Sick status, but also had an organ that would be consider Infected. So you need to mark both in the diagnosis screen. Another part of X ray is to determine if they are carrying any contraband on their insides. You will need to mark those and have them extracted and confiscate any contraband. I believe that the contraband that I found in there was a grenade, a bullet, and what looks like a black computer chip. I don't know what some of the things are. You may also find a bone. You treat this person like you would someone who was carrying Infected Parts in their luggage and send them to liquidation. Matiscope This is the tool to look into the persons eyes. The person normally has their eyes partially shut. This test is pretty straight forward, get the layer into Focus and see if there are anything floating around and most are obvious and easy to tell if it a new symptom. The only tough one to find it the Ocular Helminth as it is like a thin see through worm. The only other thing that make this complicated, is that the person normally has their eyes mostly closed. So it is hard to see if they have any of the Eye symptoms such as Yellow or Red eyes. Thankfully when you are looking into they eye, the background will match the normal color. UV Detection Tower The UV coordinates will with the scanner to see if there are hidden symptoms. They make it sound tough when the received it in the story due to the minimum batter and it only last a short time that you can use it. Even if you use the whole time, it recharges fairly quickly. Things to note is if any of their items light up when you activate the UV. They will be going to Liquidation. The thing that the game does not tell you is that if something shows up in the UV other than the UV Vapor, you need to go up to appearance and mark the correct symptom to get a good diagnosis.