Left 4 Dead

There is one way in the game by which you can not go through the first chapters on expert difficulty, but go through them on easy, after that in the game menu, you need to select the final chapter, put it on the expert level and go through.
The achievement will open without any problems.

Here's what to do:

In a single-player game, we select a campaign and set it to the easy difficulty level, then we go through the first chapters, right up to the final one, then in the final chapter, at the very beginning we don’t open the door from the shelter and don’t go anywhere!

Click on start and exit to the main menu of the game, as soon as you exit the game, install this final chapter again, but at the expert level and go through it.
That's all!

But the freebie doesn't end there!

In each final chapter, there are places where you can sit quietly, and there are also different tactics with which you can easily complete all the final chapters in each campaign.


Campaign – “No Mercy”

In the final chapter, there are two places where you can sit out without any shooting.

The first such place is on the roof, not far from the house with the walkie-talkie.

If you run into this house and turn to the right, then go out the window, there will be a descent to the lower level, jump down, then there will be another descent and there will be two ventilation units, if you jump to the right closer to the wall, then you will stand in the corner , between the ventilation unit and the wall.

Being there, the enemies will simply not be able to find you, including the tank.

But one particularly infected person, namely the Smoker, will still be able to get you out of there.

So, sitting there in the corner, listen carefully to the sounds, as soon as you hear the smoker coughing, be prepared that he will come out from somewhere and try to grab you with his tongue, you will need to have time to knock off his tongue, hit the LT button with the butt and shoot at him with a shotgun.

It is the shotgun that you will need to take with you in order to quickly kill all the smokers who find you with one shot.

Also, don’t forget to take a grenade, it will come in handy when you run to the helicopter.

The most difficult thing is when a rescue helicopter arrives and you need to quickly run to it, so that none of the specially infected people grab you.

It is best to run along the same lower level on which you were holed up.

Come out from around the corner where you were sitting and turn right, run to the stairs and go up it, then immediately turn left and run further, after you turn into the passage and go forward, there will be another staircase, straight to the helicopter platform.

You go up the stairs and wait for the helicopter to fly up.
While the helicopter is approaching, throw a grenade to distract the enemies.

As soon as the helicopter flies up, run into it, just be careful not to fall out of the helicopter on the other side, as doors will open on both sides.

You can do it alone, without the help of bots (since the character, under computer control, simply stupidly cannot stand in the corner), he will always stand on the ventilation unit and attract the attention of enemies.

So, if you are playing alone, then before answering the radio and calling a rescue helicopter, first kill your bots, just shoot them once, no need to finish them off, they will serve as bait, when you answer the radio, you will have time to take your seat.

Meanwhile, the enemies will finish off the lying bots. Once they finish off your bots, they will lose track of you.

But the easiest way is to do it with a friend. Sit in the corner and press the butt strike button all the time - LT .

This will help in case one of you is grabbed by a smoker; with a blow from the butt you can immediately free your friend from the smoker’s tongue.

Alternatively, you can try doing it alone with two joysticks. Only in this case, you will have to press the LT button alone on both joysticks.

And after the helicopter arrives, you simply turn off the second joystick and the computer will take control of this character.

At least he will cover you while you run to the helicopter, and if something goes wrong, you can sacrifice him and temporarily distract the attention of enemies from yourself in order to reach the helicopter in time.

Let's watch the video where you need to sit out:
1. https://www.youtube.com/watch?v=n716VKkUIjc
2. https://www.youtube.com/watch?v=lUFbl--Ek6s


There is another location, but it will require a second player or a second joystick.

You can sit out in the hospital elevator shaft, where you need to climb the stairs to the roof of a skyscraper.

At the very beginning, after you have left the shelter, climbed the stairs and walked along the corridor to the end, turning left you will see open doors to the elevator shaft, and on the side behind the bars there is a small passage through which you can get to the landing with stairs, along who need to climb up the roofs.

So, in this mine there is a small ledge along the entire wall, you can sit on it, and all the enemies trying to reach you will fall into the mine, including the tank.

We approach the open doors to the elevator shaft, press against the wall on the left side and look down, you will see a small ledge (you will sit on it), walk along it and stand in the middle, do not come too close to the landing, otherwise the enemies will be able to get it.

But before you sit there, you all need to go up to the roof and have one of the players answer on the radio.

Anyone who answers on the radio will have to sit out in another place, since he will no longer get on the roof.

And if you have a second joystick and play alone, then everything is much simpler.

First, everyone go up to the roof, take the second joystick and run to answer on the radio, first answer the first response, and do not answer the second for now.

Take the first joystick and go back down the shaft and sit on this ledge.

Keep in mind that when you go down, special infected people will be waiting for you in the mine, so be extremely careful and kill them all first, and then take a place on the ledge.

As soon as you sit down on the ledge, take the second joystick and respond to the second response on the radio, thereby calling a rescue helicopter.

After that, take and turn off the second joystick so that the computer takes control of the second player.

Next, we take the first joystick and, as it were, throw ourselves off the ledge on which you are sitting.
You will not fall, but simply hang.

And at this moment, while you are hanging on the ledge, all the bots will somehow “teleport” to you and lift you up.

And if the first time, not all the bots teleported, then take it and jump off the ledge again so that the remaining bots teleport to you.

The most important thing is that the bot controlling the second joystick teleports to you.

As soon as all the bots have “teleported” to you, take a place on the ledge with both players, take the second joystick and also sit on the ledge next to the first player and sit there, only this time the second joystick must be turned on all the time.

The point is that tanks will jump into the mine and some of them can throw stones, and if one of the players is hit by the tank with its stone, then on the other joystick, you need to quickly raise the wounded player.

That’s why you need the second joystick to be on all the time, otherwise when a tank approaches, the bot will start running away from it, but on the contrary, you need to sit on the ledge all the time so that the tank runs towards you and falls into the mine.

At the end, when the helicopter arrives, turn off the second joystick so that the computer takes control of the second player and everyone goes up to the roof, throw a grenade to distract the zombies and jump onto the helipad.

You just need to jump off when the helicopter already flies up and opens the doors, otherwise if you jump off ahead of time, you may be grabbed by one of the especially infected.
So be careful.

Here's a video of where you need to sit:
1. https://www.youtube.com/watch?v=E1oEr9g4pgM
2. https://www.youtube.com/watch?v=o9UUEa2LAi4

See the description of the achievement Zombicidal Maniac / Maniacal Zombie Slayer