When the game starts, upgrade in the following priority order.
1. Pistol attack power 8th level (800 points)

2. Pistol piercing shot (700 points) - points may vary

3. Pistol attack power 10th level (200 points)

4. Increased doll drop rate & increased field drop rate similarly (2000 points)
└ Think of the doll drop rate as giving more shotgun and magnum ammo, and the field drop rate as giving more pistol ammo.

5. Upgrades visible in the ammo field (100 points - convenience)

6. Upgrade auto-collect ammo (100 points - convenience)

This upgrade will progress to stage 3~4. After that, open the doors of each room with the remaining points. (Cheapest first? Expensive first? It doesn't really matter.)

When you reach stage 5, keep only a few dolls alive.
Then, go around the rooms you opened and collect bullets.
(The bullet supply decreases by 20, 40, 60, and 80% for each stage 1~5, 6~10, 11~15, and 16~20.)
(This supply amount applies to all bullets that were previously dropped.)

If you have used all your points to open the room as much as possible and collected bullets, kill the dolls you saved and proceed to the next step.

Now let's upgrade again.
1. Purchase Shotgun (250 points)

2. Increase Shotgun Attack Power Stage 4 (400 points)

3. Increase Shotgun Reload Speed ​​Stage 6 (600 points)

4. Save Shotgun Ammo (700 points) - Points may vary

5. Increase Shotgun Attack Power Stage 10 (600 points)

6. Increase Shotgun Reload Speed ​​Stage 10 (400 points)

Please continue this until stage 10, and when stage 10 arrives, open the rooms that you couldn't open due to lack of points.
And then leave only a few dolls and go around the rooms to collect bullets.
(It's convenient if you leave a scissor-grabbing doll that reacts and rushes when you shoot it.)

Start upgrading again.
1. Shotgun Magazine Level 2 (200 points)

2. Pistol Reload Speed ​​Level 4 (400 points)

3. Purchase Magnum (500 points)

4. Magnum Attack Power Level 10 (1000 points)

5. Purchase Magnum Headshot (700 points)

6. Magnum Reload Speed ​​Level 10 (1000 points)

※ After that, you can proceed with the upgrade you want.

When you start the game, if you go to the 'end of the right corridor' based on the screen, you can set up further back than the doll spawn location.

So, it is a 'safe place where you can respond by looking only forward without worrying about the back or the side'.

You can do it roughly until stage 5, but let's think about playing mainly here after that.

If you open the door that can be opened with 180 points in the back first,
it will be easier to respond when the jumping doll or giant doll runs towards you.

As explained earlier,
this survival mode can be seen as 'saving shotgun ammo'.

The shotgun is the strongest and has the fastest reload speed, so it is the easiest to respond.

Therefore, it is important to set up at the 'end of the right corridor' and respond as much as possible with a pistol or revolver when it is safe, and save ammo.

Let's briefly explain based on the above.

1. Set up at the end of the right corridor in each stage and hold out. 2. When the enemy approaches so close that it is difficult to even reload, use a shotgun to clear them out.

3. Use Magnum to clear out jumping dolls, giant dolls (overdose), and the left spawn dolls.

4. Use a pistol to deal with dolls walking slowly in front. (Maximum use of penetration shots)

5. When there are about 30 left, go around to clear them out. (When there are no more jumping dolls)

6. Delsey, who appears every 3 stages, can be put to sleep with one shot by aiming at the head with a shotgun and shooting.
└ When the discharge is over and she gets up again, shoot her again when she seems almost up, and she will discharge again.
└ When the charge gauge turns green, keep an eye on it and roughly switch to the shotgun in advance.
└ Up to stage 6, you can roughly respond by shooting her in the head several times (3S = four shots, 6S = six shots) with a pistol.
└ If you are late in responding and there is not enough space behind you, you should go to the opposite side and open up some distance when Delsi wakes up.
(If you can't control the distance and get stuck in the wall, it will be very difficult.)

At this point, you should be able to proceed to stage 20 without any problems.
In my case, who collected all the upgrade point perks, after clearing the last 20 stages, I had 0 pistol rounds, 0 magnum rounds, and about 300 shotgun rounds left.
(If you don't manage your ammo supply, you will run out of bullets around stage 17 and play precariously.)

1. You have to go around every stage to clean up the ones that come running with scissors when you shoot.

Be careful because there are times when dolls can't come out from the back because of the entrance blocking.

2. If you managed your ammo well, you can hold out with a shotgun while the running dolls come out,
and when it's time to clean up, you can use a pistol and revolver.

3. Features of each gun.

First. Pistol
It's a basic gun that's easy to respond to because it gives stiffness if you aim for headshots, although the damage is weak, and it reloads quickly and has a lot of bullets. As I said before, let's try to use a pistol when you can make a penetrating shot.






Second. Shotgun
As you can see in the image, after stage 9, the light goes out and the area gets darker and darker, and around stage 17, the light disappears completely.

Still, it's a gun that's excellent in everything else, so I have no choice but to use it (after all, it's a shotgun against zombies).

When it seems like there's nothing nearby, let's switch to a pistol and use it as a temporary substitute for the flashlight.

Third. Magnum
The damage is about 3 times that of a pistol based on a headshot, but the reload speed is evil.
When the bullets reach 0, it automatically reloads, but in this game, you cannot cancel the reload.
I recommend using it with a reload speed of 10. (It's still slow.)

The only advantage is that even if you increase the movement speed to 10, this gun won't run with the muzzle up.
This means that the light will continue to illuminate the front.

4. Custom Nurse
Customize the dolls' hair so that it doesn't cover their eyes.
Because you have to fight while looking at anything shiny as much as possible, and that's the eyes.
It's no exaggeration to say that when you fight with a shotgun, that's the only thing you can see.

5. Be careful of the jumping doll and the giant doll.
To be honest, the other dolls are not so different that you don't really need to worry about their characteristics in survival mode,
but even if you run past them, they won't catch up.
However, the jumping doll, which has a fast movement speed, and the giant doll, which has a long dash distance, are the ones that are most likely to cause trouble if you make a mistake, so it's a good idea to cover them up.

I've customized these two enemies so that they stand out, making them easy to distinguish.

At this level, unless you make a mistake, you should definitely be able to clear it. I've tried it a few times, and since it's a stable play, the clear time always comes out to around 2 hours.

Credit goes to them (I just did the translation)
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3476793729