As a narrative puzzle game that focuses on integrated maps and seamless exploration, "Endless Nightmare" actually has a lot of ingenuity in its mechanics. Many players will be attracted by its atmosphere at the beginning, but they will be stuck in a certain puzzle for a long time and cannot get out, or they will miss key items and the plot will not connect. I have completed the level three times and have reviewed the locations of all the puzzles and collectibles. I simply sorted out the experience and wrote it in a logical order. I hope it can help you avoid detours 🧠
Let's talk about a core mechanism first: the puzzles in the game are not linear. Most clues are distributed in multiple scenes, and some props will “refresh” their positions as you advance through the plot. Therefore, it is recommended that every time you arrive in a new area, you should do two things first: first, press the F key (or the explore icon on the touch screen) to scan all interactive items and record the prompt text; second, scan every corner of the current map, especially those drawers, bookshelves, and wall cracks that seem to be just background decoration, because many hidden items are hidden in blind spots.
Take the first chapter "Abandoned Hospital" as an example. There is a common stuck point: the password cabinet at the nurse's station. Many players see "3-7-5" on the medical record and enter it directly, but they cannot open it. In fact, the numbers on the medical record are in reverse order, and the corresponding real password is "5-7-3" because the date mark in the medical record says "please turn it upside down when viewing it." At this time, if you have been to the basement before and the flashlight you picked up has a crack on the back, switch to it and take a photo of the medical record, you can see the hidden fluorescent handwriting, which prompts "second digit + 1", so the final password is 5-8-3. Many guides don't mention this detail, but follow this order and it will be done in one go.
Let's talk about collection: there are a total of 12 “memory fragments” in the whole picture, distributed in different chapters. They will not be marked on the mini-map, but there is a rule: in the map of each chapter, there are 3 fixed "highly interactive areas" (such as places that require puzzles, unlocking, and combining items). Within 1-2 screens near these areas, there is a 90% probability of having a fragment. For example, in Chapter 2 "Echo Corridor", after solving the pendulum puzzle, don't rush away. Look back at the back of the pendulum base. There is a blackened screw. After interacting with it, you can get the fourth fragment. If you want to collect them all, it is recommended to scan along the sealed wall every time you complete a puzzle to prevent missing.
Regarding the difficulty ranking of puzzles, I personally think it is best to put puzzles with "number/letter correspondence" properties later. Because your item bar is limited in the early stage, some clues need to be completed from the notes in the second half. For example, the safe in the "Archives Room" in Chapter 3 has an 8-digit number based on the year of employment of four employee records, but two of them were picked up in the ruins of Chapter 4. If you try it randomly in Chapter 3, it will take time and trigger an alarm (forcing you to return to the save point). So my suggestion is: give priority to exploring all areas that can be directly entered, and solve the puzzles that can directly get clues from the environment. Mark the ones that are stuck, and come back later when you get new props or new notes.
The numerical value is not complicated, but there is a hidden benefit: every time 3 memory fragments are collected, the game will unlock an additional plot audio and place it in the "recorder" in the main menu. These audios are important for worldview explanations, such as explaining why the protagonist has the same nightmare over and over again, and the hospital's "mirror floor" mechanism. So if you only follow the main line, you may feel that the plot jumps a bit, but after listening to the audio, it will be completely connected.
One final tip: the game does not have automatic saves, but there are many manual save points. Develop the habit of going to the save point at the end of each chapter. If you make a mistake in solving a puzzle midway and cause items to disappear, you can save it by loading the save point. I tested it in the second game. After loading the file, the puzzle status is reset, but the collected fragments will not be cleared. This is very friendly.
Overall, "Endless Nightmare" has a good balance between puzzle density and narrative rhythm. As long as you clear the map according to the area and don't hesitate to try the password, you can basically complete it within 8 hours. I hope this guide can help you dig out all the hidden content 🔍