Train Brake Puzzle Solutions
You must determine which combination of 10 numbers adds up to a specified target number. For the first puzzle, there are three possible numbers and three possible solutions.

36: 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 9
67: 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 4
81: 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 + 9
The second puzzle also has three numbers and three solutions:

42: 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 6
53: 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 8
67: 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 4

Weapons


---Rebecca's Handgun:

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This is Rebecca's starting weapon


---Billy's Handgun:

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This is Billy's starting weapon


---Knife:

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Billy has this as another starting weapon.

Make sure to pick up the second Knife in the 2F of the Train as well since it counts as another weapon for the achievement; here is its location:


---Hunting Gun:

A double barrel Shotgun you find in this location on the 2F of the Train:


---Molotov Cocktail:

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Made by combining "Empty Bottle" with "Gas Tank"


---Shotgun:

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Found in the 1F of the Training Facility; here is the location on map:


---Grenade Launcher:

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You can pick it up from the Art Room in the 2F of the Training Facility; here is the location:
Load all 3 different grenades in it (Grenades, Napalm Grenades and Acid Grenades) to make sure it's counted for the Achievement.


---Custom Handguns:

Adding "Handgun Parts" to any Handgun will turn it into a Custom Handgun.

To get the "Handgun Parts", first get the "Locker Key" from this location: (Red X)Then use it on the Locker located at (Blue X)

You will find a "Duralumin Case"; examine it to reveal the combination to open it then examine the dial to enter the combination
CODE IS: 385

You will get the "Handgun Parts" that you can combine with either Billy's Handgun or Rebecca's Handgun to get the Custom Handgun.

You need to make both of the Custom Handguns in 2 different runs on the same save file to progress the Achievement, therefore, remember which one you made in the first run and make the other one by playing "Once Again".

---Magnum:

You can get it from a dead body in the Cable Car.

---Sub-Machinegun:

Reward for completing the game under 5 hours in any difficulty.

Keep in mind that you can only use the unlocked weapons in the difficulty you unlock them in by loading the Clear Game Save File and playing "Once Again".


---Rocket Launcher:

Reward for completing the game under 3.5 hours in any difficulty.

Keep in mind that you can only use the unlocked weapons in the difficulty you unlock them in by loading the Clear Game Save File and playing "Once Again".


---Magnum Revolver:

This is the gun that Rebecca throws to Billy to finish the Queen Leech in the end-game.

You unlock it by collecting 90 Leeches in "Leech Hunter Mode"; save the Clear Game File after doing so and start a new game by clicking "Once Again" after loading the save file.

By playing "Once Again", you can find the Magnum Revolver in this location on the Train:

Unlimited Ammo on all Guns
To unlock unlimited ammo on all guns, you need to collect all 100 Leeches in "Leech Hunter Mode";
Leech Hunter Mode can be played after completing the game once and loading the clear game save file;

After collecting the 100 Leeches, save the clear game file and load it then play "Once Again" and any weapon you use will have unlimited ammo.