Hi! Just let you know that my english is not excelent, 'cause I'm Portuguese. Here you can search hints for a level that you are stuck. Please let me know if I've got something wrong.

Good luck!
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*Soon*
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This page is under construction, so I will constantly update it with new informations.
[In Course] Update 1: Added Season 1 missions
Update 2: ![Not ready yet]!
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Season 1 gives you access to:

• 25 in-game missions
  
• 65 puzzles to solve
  
• 5 hidden missions (unlocked by obtaining “puzzle pieces” or secret answers in-game)
  
• Community sandbox missions

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Mission 1: Basic Training
Part I
Hints:

• All you need is in the image
  
• Pay attention to unusual marks

Solution: Target located
Puzzle Piece Code: Thallium
Part II
Hints:

• Pay attention to small details
  
• Pay attention to the seal

Solution: Successful extraction

Mission 2: Training Ground
Part I
Hints:

• All you need is http://www.asciitohex.com/ and the coded message
  
• Decimal
  
• 105 110 32 112 111 115 105 116 105 111 110

Solution: In position
Puzzle Piece Code: Cadmium
Part II
Hints:

• All you need is http://www.asciitohex.com/ and the coded message
  
• https://en.wikipedia.org/wiki/ROT13
  
• Remembert that you are being asked for a location

Solution: INTERCEPT TARGET IN SHANGHAI

Mission 3: Advanced Preparation
Part I
Hints:

• PHOTO ID #1040
  
• Remember http://www.asciitohex.com/
  
• https://en.wikipedia.org/wiki/ROT13 and https://en.wikipedia.org/wiki/Hexadecimal
  <--------------------------------------------------------------------------------------->
  
• Cipher Manuscripts
  
• Who originaly owned the item that is being auctioned?
  
• Remember that you are being asked for a culprit

Solution: Hermetic Order of the Golden Dawn
Puzzle Piece Code: Indium

Mission 4: Ressuply
Part I
Hints:

• The suppliers are written on the invoices you have
  
• https://upload.wikimedia.org/wikipedia/commons/d/d7/Blue_Morpho.jpg

Solution: Morpho Medical
Puzzle Piece Code: 87.62
Part II
Hints:

• http://morphomedical.com/
  
• Note a tab on the left side, it is the Automated Support
  
• https://en.wikipedia.org/wiki/Heavy_water
  
• Remember that you are being asked for the confirmation code of the order

Solution: 200276

Mission 5: Radiation
Part I
Hints:

• The case number is in the image
  
• MSPaint or a similar software could be useful

Solution: DN98A1
Puzzle Piece Code: 101.17
Part II
Hints:

• The photo id is in the image
  
• MSPaint or a similar software could be useful

Solution: 3053
Part III
Hints:

• You need to investigate the leads in the list, Google is your friend
  
• Ignore blasts
  
• Foncus on the 50's
  
• Foncus on newborns testing
  
• Remember you are being asked for a sustance

Solution: Iodine

Mission 6: Clinical Trials
Part I
Hints:

• All you need is in the documents provided
  
• One of the three doctors worked in a place where human testing would be way easier
  
• Nathaniel

Solution: Holmesburg Prison
Puzzle Piece Code: 180.94788
Part II
Hints:

• All you need is in the image
  
• MSPaint or a similar software could be useful

Solution: 665-XX8
Part III
Hints:

• Follow the instructions you are given
  
• Placing a microphone in each floor could be a good idea

Solution: 81482A

Mission 7: Wire Tap
Part I
Hints:

• https://en.wikipedia.org/wiki/Experiments_in_the_Revival_of_Organisms
  
• autojektor
  
• http://archive.blackwatchmen.com

Solution: Bone Marrow
Puzzle Piece Code: 3306
Part II
Hints:

• Search by States of Matter

Solution: Liquid

Mission 8: The Substance
Part I
Hints:

• That day her favourite team won in the NBA league
  
• The name of the team is the intranet password
  
• Who's the Dr.?

Solution: M55
Puzzle Piece Code: 3695

Mission 9: Social Engeneering
Part I
Hints:

• Just ask Google about those organizations
  
• You should be able find a facebook page of one of those medical organizations

Solution: Superterram Life Sciences
Puzzle Piece Code: 1115
Part II
Hints:

• On the facebook you can see a link to a person who works there, she is your objective
  
• You need to email her using the completed template given to you
  
• To complete the template look at her facebook page and you will find the bits of info you need

Solution: RBG55432443

Mission 10: Supplier Investigation
Part I
Hints:

• There is something in the list that should be light but is quite heavy instead
  
• The solution is the weight

Solution: 108.2
Puzzle Piece Code: 505.08
Part II
Hints:

• In that page there is something at plain sight that says "I'm vulnerable"
  
• Outdated software is very vulnerable
  
• The solution is the name of the software

Solution: Hexmo Plugin
Part III
Hints:

• Ther is a place metioned in those documents where lost bodies would not be missed

Solution: Sunny Forest Orphanage

Mission 11: Raid on Rosenberg
Part I
Hints:

• You have the answer in the document

Solution: 3409
Puzzle Piece Code: 115.78
Part II
Hints:

• If send an email to the rosenberg clinic you may get an answer from your target
  
• The clinic's secretary Linda Moss is your objective, maybe an email would work
  
• Her email address follows the the same pattern as the rest of staff's emails
  
• Her response may not be of much help, but there should be something hidden in it
  
• "life is full of surprises but never when you need one" will guide you to her intranet password and to the solution

Solution: DAK-29

Mission 12: Test Results
Part I
Hints:

• Try to put those numbers in Excel
  
• Pay attention to the shapes in the graphics
  <--------------------------------------------------------------------------------------->
  
• Keep in mind what the text of the mission is asking for
  
• All you need is in the report

Solution: Felis Silvestris
Puzzle Piece Code: Winkler

Mission 13: Two Headed Eagle
Part I
Hints:

• The dechipering key is a complete sentence, commas and periods included
  
• http://biblehub.com/
  
• Note the format xx:xx
  
• Keep in mind we are the BLACK Watchmen NOT the WHITE Watchmen
  <--------------------------------------------------------------------------------------->
  
• Keep in mind what the mission is asking for

Solution: Brother Metemius
Puzzle Piece Code: Oganessian
Part II
Hints:

• Googling "the second innocent" gives you the person you are looking for
  
• This person gave that order a "gift" (aka privilege)
  
• http://www.abs-temple.com/GiftGoesHere.html
  <--------------------------------------------------------------------------------------->
  
• Keep in mind what the mission is asking for

Solution: Ancient Brotherhood of the Solar Temple

Mission 14: The Ancient Brotherhood
Part I
Hints:

• perdurabo
  
• 999 - 333 = 666 (DCLXVI)
  
• the words of 418 to DCLXVI
  <--------------------------------------------------------------------------------------->
  
• PRAY!

Solution: Hellfire Club
Puzzle Piece Code: Marguerite

Mission 15: Hellfire
Part I
Hints:

• The Order of the Friars of St Francis of Wycombe
  
• Francis Dashwood, 11th Baron le Despencer
  
• Medmenham Abbey
  
• cross-eyed

Solution: John Wilkes
Puzzle Piece Code: Hofmann
Part II
Hints:

• 14 years old
  
• coffin
  
• The Scandalous Father of Civil Liberty

Solution: Ann
Part III
Hints:

• http://sourceforge.net/projects/audacity/
  
• The solution is a date
  
• The format is: Month DD YYYY
  
• https://en.wikipedia.org/wiki/Solstice

Solution: December 21st 1760

Mission 16: The Rare and the Exotic
Part I
Hints:

• Location is everything
  
• The location is given to you in the GMap, you only need to look around a bit.

Solution: Metro Self Storage
Puzzle Piece Code: 19.84
Part II
Hints:

• What code do people who can't see use?

Solution: 224-678-0415

Mission 17: Insider Trading
Part I
Hints:

• Note that the assistant is talking about "playing sets", that doesn't seem like "conventional art".
  
• Weber is an illustrator of a famous trading card game.
  
• And the the name of the game is the solution.

Solution: Magic the Gathering
Puzzle Piece Code: 15.10
Part II
Hints:

• It is a printing technique. A reverse image search can help.
  
• All you need is the name of the correct card manufacturer with a facility in Texas.

Solution: Cartamundi

Mission 18: The Manor House
Part I
Hints:

• The route is as follows: Porch, Kitchen, Service stairs (visible from Rear Hall), Central cellar
  
• Try to write down the times when a guard could see the infiltration route. You'll see the 30 secs window.
  
• "Key" guards: G1, G4 and G5

Solution: 03:12:45
Puzzle Piece Code: 18.95
Part II
Hints:

• You will need the following formulae:
  * Area of a rectangle
  * Area of a circle sector
  * Area of a triangle
  * Area of a circle segment
  * Side of a triangle given the opposite angle and two sides (SAS triangle)
  
• Alcove (rectangle area)
  8' is given.
  You need to subtract two measurements of the Guest Chamber to obtain the length of the side.
  
• Guest Chamber (rectangle area)
  12' 6'' is given.
  You have the half of the other side, just multiply by 2.

Solution: 310
------------------------------- I'll upload more missions once I finish it. --------------------------------

*Soon*

Mission 1: Four Pillars
Part I
Hints:

• The password is the difference between the movie version of the character and the real life person.
  
• ----

Solution: ------ ---- -

*Soon*

*Soon*

I did this guide alone. But i copied some information in The Black Watchmen's forum, so thank you very much.
Guide created by:
My steam: http://gtm.steamproxy.vip/id/xico_2001
My other guides: https://gtm.steamproxy.vip/id/xico_2001/myworkshopfiles/?section=guides

Hints provided by:
Topic: http://forums.blackwatchmen.com/index.php?threads/season-1-megathread.1102/
Owner's profile: http://forums.blackwatchmen.com/index.php?members/jantsop.933/