If you prefer to eliminate enemies quietly but are be finding it difficult, find an indestructible object such as a barrel or container and take it with you. When you find several enemies, stand in a position where you want an enemy to approach. While holding the barrel, throw it next to yourself or close to where you wish your target to approach. The entire group will be alerted upon hearing the object slam to the ground or wall you threw it at, but will only approach to investigate. The enemy will walk to the area alerted, stand where the sound came from, then start walking back after finding nothing. You can now knock them out or kill them undetected at your desired location. Note: If you throw the object a long distance, the investigating enemy may track the object's flight path directly back to your position. It is better to throw it nearby for repeated use.

In the list of usernames and passwords for the police station first floor computers located in one of the pocketboys, there is one listed as: user "rdeckert", password "unicorn". This is a reference to the main character from Blade Runner and the unicorn from the visions in the film.

One of the computers in the Singapore secret facility contains an email that mentions a stapler. The person's name is "Dwayne" (instead of Dwight) and mentions setting up a hidden camera to catch someone. The bottom of the messages reads "I know you have it Jim."

Reach Hengsha; it is on the first mission upon your arrival. When you get to the hacker's apartment, look underneath the desk or above the computer in the left corner to see the "Forever Alone" meme on a Post-It note.

Enter Pritchard’s office and look on his wall above his motorcycle to spot the Final Fantasy 27 game of the future.

The QR codes on boxes and other things in the game are real. Scan them off your screen with a cellphone to read the secret messages.

In Hengsha, all the stores have a back door. Open it and walk inside for a Traveler bonus of 100 XP.

Upgrade Hacking and Strength and you can pick up turrets, which have unlimited ammo. Set them down or let them fire while you move to clear out a room easily! You still earn experience, including headshots. This can also be done with robots.

The following are all of the numerical codes for Safe Panels, Bomb Panels, Security Panels and Laser Grid Panels in the game:

Sarif HQ
PANEL - CODE
Helipad Storage - 8053(Security Panel)
Sarif Industries F3 (Denzel Mitchell Office) - 1364(Security Panel)
Sarif Industries F3 (Ted Bruger Office) - 9642(Security Panel)
Sarif Industries F3 - 0250(Security Panel)
Sarif Industries F2 (Frieda Malik Office) - 5475(Security Panel)
Sarif Industries F2 - 3716(Security Panel)
Sarif Industries F2 (Mike Pine Office) - 4145 (Security Panel)

Sarif Manufacturing Plant
PANEL - CODE
Assembly Line 1 F2 - 1505 (Bomb Panel)

Detroit City Streets
PANEL - CODE
Detroit City Streets (North) - 0187(Security Panel)
Detroit City Streets (Central) - 2928(Security Panel)
Detroit City Streets (Central) - 1904(Security Panel)
Detroit City Streets (Central) - 6542(Laser Grid Panel)
Detroit City Streets (Central) - 0002(Security Panel)
Detroit City Streets (East) - 4891(Security Panel)
Detroit City Streets (East) - 1966(Security Panel)
Detroit City Streets (Southwest) - 8982(Security Panel)
Detroit City Streets (Southwest) - 4626(Security Panel)
Detroit City Streets (Southeast) - 5551(Security Panel)
Detroit City Sewers - 2599(Security Panel)
Detroit City Sewers - 0000(Bomb Panel)
Detroit Sewers - 8218(Laser Grid Panel)
Detroit Sewers - 0110 (Security Panel)

Detroit Apartments
PANEL - CODE
Jensen's Apartment - 5375(Safe Panel)
Apartment 2 F1 - 0739(Safe Panel)
Apartment 2 F2 - 3733(Security Panel)
Apartment 3 B1 - 8974(Security Panel)
Apartment 3 F1 - 1077(Security Panel)
Apartment 3 F1 - 1029(Security Panel)
Apartment 3 F1 - 1031(Safe Panel)
Apartment 3 F2 - 3663(Security Panel)
Apartment 3 F2 - 8221(Security Panel)
Apartment 3 F2 - 2356(Security Panel)
Apartment 4 F3 - 1948(Safe Panel)
Apartment 4 F3 - 7767 (Security Panel)

Detroit Derelict Row
PANEL - CODE
Derelect Row F1 - 3290(Security Panel)
Derelect Row F1 - 5962(Security Panel)
Derelect Row F3 - 5463 (Safe Panel)

Detroit Police Department
PANEL - CODE
B1 - 2599(Security Panel)
B1 - 7366(Laser Grid Panel)
B1 - 7366(Laser Grid Panel)
B1 - 9212(Security Panel)
F1 - 4816(Security Panel)
F1 - 1856(Security Panel)
F3 - 2231(Security Panel)
F3 - 6065(Security Panel)
F3 - 3727 (Security Panel)

Fema Camp
PANEL - CODE
Fema Interior B1 - 7984(Security Panel)
Fema Interior B1 - 7984(Security Panel)
Fema Interior B1 - 7984(Security Panel)
Fema Yard F1 - 7984(Security Panel)
Fema Yard F1 - 7984(Laser Grid Panel)
Fema Yard F1 - 7984 (Laser Grid Panel)

Hengsha City Streets
PANEL - CODE
Hengsha Streets (West) - 3444(Safe Panel)
Hengsha Streets (East) - 1381(Security Panel)
Hengsha Streets (East) - 1339(Security Panel)
Hengsha Streets (East) - 1379(Security Panel)
Hengsha Streets (East) - 7845(Security Panel)
Lower Hengsha Streets (South) - 5377 (Security Panel)

Hengsha Buildings
PANEL - CODE
Hung Hua Hotel - 7657(Safe Panel)
Alice Garden Pods F1 - 3785(Security Panel)
Alice Garden Pods F1 - 3824(Security Panel)
The Hive - 0415(Security Panel)
The Hive - 8953 (Safe Panel)

Tai Yong Medical
PANEL - CODE
Storage Area - 4865(Security Panel)
Storage Area - 5720(Security Panel)
Storage Area - 0821(Security Panel)
Pool - 7934(Security Panel)
Pool - 9409(Laser Grid Panel)
F1 - 4713(Security Panel)
F3 - 9762(Laser Grid Panel)
F3 - 9762(Laser Grid Panel)
F3 - 2459(Laser Grid Panel)
F3 - 5126(Laser Grid Panel)
F4 - 2967(Security Panel)
F4 - 3090(Security Panel)
F4 - 6906(Security Panel)
Penthouse - 0117 (Safe Panel)

Picus
PANEL - CODE
F1 - 0068(Security Panel)
Restricted Area F1 - 0101(Security Panel)
Restricted Area F1 - 1006(Security Panel)
Restricted Area F3 - 1980 (Security Panel)

Harvester
PANEL - CODE
Harvester Territory B2 - 7920 (Safe Panel)

Hengsha Seaport
PANEL - CODE
Seaport F1 - 7785(Security Panel)
Seaport F2 - 4589(Security Panel)
Seaport F3 - 3295 (Security Panel)

Omega Ranch
PANEL - CODE
Omega F1 - 2410(Security Panel)
Omega F1 - 9992(Security Panel)
Omega F1 - 2535(Laser Grid Panel)
Omega F1 - 1385(Security Panel)
Omega F1 - 0111(Security Panel)
Omega F1 - 0111(Security Panel)
Omega F2 - 5377(Security Panel)
Omega F2 - 1504 (Security Panel)

Panchaea
PANEL - CODE
Port of Entry - 7153(Security Panel)
Machinery - 9823(Security Panel)
Machinery - 9823(Security Panel)
Tower - 8024 (Security Panel)

-When hacking, save the game and hack the optional nodes-- but do not complete the hack. After hacking the nodes, load the previous saved game. Repeat the process. When you finally complete the hack, you will get all the nodes (from the previous times you loaded) along with the nodes you get normally. Use this on the computer in Jensen's office for 500 experience points every time you load for easy Praxis points.

-Hack everything you can if you have the required Hacking skill. This will result in easy experience points as well as possible access codes and credits.

-Non-lethal takedowns and kills earn more experience points than the lethal variety. Note: If you have the Reflex Booster Augmentation, you can will earn 125 experience points from a non-lethal takedown.

-In Hengsha, China every store has a back door. Open it and walk inside for a Traveler bonus of 100 experience points.

Use the following answers to the conversations to unlock the best ending for that person:

Zeke Sanders
Empathize, Empathize, Empathize, Empathize.
Zeke will release the hostage and flee. If you let Zeke leave but make a mistake in the rest of the conversation, he will still go but the hostage will die.

Wayne Haas
Absolve, Absolve, Absolve/Plead, Crush.
This givesyou unrestricted access to the non-restricted areas of the Detroit police station. Note: This unlocks the "Desk Job" achievement.

David Sarif
Refocus, Refocus, Refocus, Defend.
David will give you emails and records about Adam's past and the security loophole. Note: This unlocks the "Yes Boss" achievement.

Tong Si Hung
Pinpoint, Advise, Pinpoint.
Adam can go downstairs to meet with the Triad leader that owns The Hive. Note: This unlocks the "Darker Shades" achievement.

Bill Taggart
Confront, Discredit, Confront, Discredit.
Bill Taggart gives you the location of Dr. Isaias Sandoval. Note: This unlocks the "Throwdown" achievement.

Doctor Isaias Sandoval
Tough Love, Empathize, Empathize.
This prevents Isaias Sandoval from killing themself. Note: This unlocks the "Last Straw" achievement.

Hugh Darrow
Extrapolate, Extrapolate, Appeal, Extrapolate/Appeal.
Hugh Darrow deactivates the security system and you will get the code to shut down the Hyron system. Note: This unlocks the "Final Countdown" achievement.

When waiting for the Funicular to come up in Picus Communications, enemies will appear. Before pressing the elevator button, save the game. Use heavy objects to block both entrances into the room. Note: This requires the Move/Lift Heavy Objects Augment. You can use the two vending machines outside the room, two crates next to the security computer, and the turret in the middle to block the lower doorway and the side corridor. If done correctly, the guards will stay outside while you are waiting for the Funicular.

Once you go to China and then to the penthouse, look in the bathroom and notice a shelf with three shells instead of toilet paper. This is a joke in Demolition Man.

Enter the men's restroom at The Hive and find a pocket secretary that gives the door code for the back room. It also states that someone broke the first rule by talking about what goes on in the basement and is signed "T".

ACHIEVEMENT - HOW TO UNLOCK
Cloak & Daggers (10 points) - Deal with the man in the shadows.
Smash the State (10 points) - Help Officer Nicholas take out the trash.
Acquaintances Forgotten (10 points) - Follow Pritchard's lead to uncover the truth.
Doctorate (50 points) - Read all 29 unique XP books within a single playthrough.
Lesser Evil (10 points) - Deal with Mr. Carella's indiscretion.
Motherly Ties (10 points) - Put a grieving mother's doubts to rest.
Corporate Warfare (10 points) - Protect a client's interests by performing a less-than-hostile takeover.
Talion A.D. (10 points) - Descend into the bowels of an urban jungle and confront a warrior-priest.
Gun Nut (20 points) - Fully upgrade one of your weapons.
Bar Tab (10 points) - Help the Hive Bartender settle a tab.
Rotten Business (10 points) - Help a lady in the oldest of professions clean house.
Shanghai Justice (10 points) - It may take some sleuthing, but justice must be served.
Hax0r1! (15 points) - Successfully hack 50 devices within the same playthrough.
Transhumanist (5 points) - Fully upgrade your first augmentation of choice.
Consciousness is Over-rated (15 points) - Knock out 100 enemies in a single playthrough.
First Takedown (5 points) - Perform your first Takedown. Civilians don't count, so be nice.
Opportunist (15 points) - Perform 50 takedowns within the same playthrough. (Civilians don't count.).
First Hack (5 points) - Perform your first Hack successfully.
Deus Ex Machina (50 points) - Experience all the different endings that Deus Ex - Human Revolution has to offer.
Pacifist (100 points) - Complete Deus Ex - Human Revolution without anyone dying by your hand. (Boss fights don't count.).
Foxiest of the Hounds (100 points) - Complete Deus Ex - Human Revolution without setting off any alarms.
Up the Ante! (15 points) - Upgrade your first weapon of choice.
Trooper (50 points) - Complete Deus Ex - Human Revolution.
Legend (100 points) - Complete Deus Ex - Human Revolution at its hardest setting without ever changing the difficulty.
Ghost (15 points) - You made it through an entire hostile area without so much as a squeak.
Sentimental Value (10 points) - You kept Megan's bracelet for yourself. Apparently, letting go really is the hardest part.
The Take (10 points) - Greedy bastard. You accepted O'Malley's blood money and let him go.
Guardian Angel (10 points) - You paid poor Jaya's debt in full. How very.. humane.. of you.
The D Project (15 points) - You watched the entire credit list and saw the surprise at the end.
Good Soul (15 points) - Against all odds, you saved Faridah Malik's life.
Hangar 18 (10 points) - You found and read the secret message. Now you know too much..
Super Sleuth (10 points) - You really nailed your case against Lee Hong.
Ladies Man (10 points) - You convinced Mengyao to spill the beans on the mysterious Hyron Project.
Balls (5 points) - Seems you like playing with balls, eh?
Lucky Guess (10 points) - Next time, Jacob better use a more complex code to arm his bombs.
Kevorkian Complex (10 points) - You granted a dying man his final request.
The Fall (10 points) - You sent Diamond Chan on the trip of a lifetime.
The End (25 points) - You defeated Zhao Yun Ru and destroyed the Hyron Project.
Old School Gamer (10 points) - You found all the hidden story items in Megan's office. Point and Click much?
Unforeseen Consequence (15 points) - You convinced Zeke Sanders to let his hostage go.
The Bull (25 points) - You defeated Lawrence Barrett, elite member of a secret mercenary hit squad.
The Mantis (25 points) - You defeated Yelena Fedorova, elite member of a secret mercenary hit squad.
The Snake (25 points) - You defeated Jaron Namir, Leader of Belltower's Elite Special Operations Unit.
The Throwdown (15 points) - You convinced the smooth-talking politician Bill Taggart to tell the truth in public.
The Last Straw (15 points) - You talked Doctor Isaias Sandoval out of suicide.
The Final Countdown (15 points) - You showed millionaire Hugh Darrow that his logic was flawed.
The Desk Job (15 points) - You convinced Wayne Haas to let you into the morgue.
Yes Boss (15 points) - You had an argument with your boss, David Sarif, and won.
Darker Shades (15 points) - You convinced a fast-talking bartender to let you see Tong Si Hung.

The Missing Link" achievements
ACHIEVEMENT - HOW TO UNLOCK
Factory Zero (70) - You survived The Missing Link using no Praxis kits, weapons, or explosives. Whoa.
Never Stop Looking (20) - You escaped Rifleman Bank Station. Nothing will stop you from finding Megan now.

The following is every Terminal and Security Terminal and their corresponding username and password:

Sarif HQ
TERMINAL - USERNAME - PASSWORD
Sarif Industries F2 - User: fpritchard - Pass: nuclearsnke
Sarif Industries F3 - User: tbruger - Pass: eclipse
Sarif Industries F3 - User: ajenson - Pass: mandrake
Sarif's Office - User: amargoulis - Pass: gsspgirl
Factoring Lans F1 - User: doutchman - Pass: windmill
Admin F2 - User: fmarchand - Pass: factotum
Admin F2 - User: gthorpe - Pass: hydro
Admin F2 - User: rmccauf - Pass: hvywethr
Admin F2 - User: sgrimes - Pass: ovid
Admin F2 - User: tcaldwell - Pass: talon
Admin F2 - User: mross - Pass: lions
Admin F2 - User: fbrooks - Pass: tipple
Admin F2 - User: vclark - Pass: tigers
Admin F2 - User: cparker - Pass: zinc
Admin F2 - User: mlatona - Pass: redwings
Admin F4 - User: jthorpe - Pass: hydra
Factoring Labs F1 - User: doutchman - Pass: windmill

Detroit
TERMINAL - USERNAME - PASSWORD
Jenson's Apartment Lobby - User: sterhorst - Pass: queenbee
Apartment 3 F2 - User: docta - Pass: atcod
Apartment 3 F1 - User: omalley - Pass: trojan
Police Department F1 - User: bsterling - Pass: investor
Police Department F1 - User: pdick - Pass: lectrolam
Police Department F1 - User: jballard - Pass: solempire
Police Department F1 - User: jchampagne - Pass: grimster
Police Department F1 - User: wgibson - Pass: baronnull
Police Department F1 - User: rdeckard - Pass: unicorn
Police Department F1 - User: hellison - Pass: cordwainer
Police Department F1 - User: bbethke - Pass: maverick
Police Department F1 - User: pcadigan - Pass: desprit
Police Department F1 - User: mfrezell - Pass: liezerf
Police Department F1 - User: whass - Pass: catharsis
Police Department F2 - User: fnicefield - Pass: patriotism
Police Department F2 - User: cleboeuf - Pass: dasteer
Police Department F2 - User: rpenn - Pass: apophenion
Police Department F3 - User: cwagner - Pass: fuckface
Police Department F3 - User: fmccann - Pass: solanum
Police Department F3 - User: jalexander - Pass: basileus
Police Department F3 - User: bgum - Pass: justicar
Police Department F3 - User: guest - Pass: password1
Police Department F3 - User: amurphy - Pass: thighgun

Fema Camp
TERMINAL - USERNAME - PASSWORD
Fema Yard F1 - User: wks0012 - Pass: ntlec59
Fema Yard F1 - User: spaxxor - Pass: neuralhub
Fema Interior B1 - User: spaxxor - Pass: neuralhub
Fema Interior B1 - User: spaxxor - Pass: neuralhub
Fema Interior B1 - User: wks0010 - Pass: usprokt
Fema Interior B1 - User: lbarret - Pass: bullskull
Fema Interior B3 - User: spaxxor - Pass: neuralhub
Fema Interior B3 - User: spaxxor - Pass: neuralhub
Fema Interior B3 - User: wks2011 - Pass: crrctions
Fema Interior B3 - User: wks3021 - Pass: hmldsec1
Fema Interior B3 - User: wks4145 - Pass: hmldsec2

Hengsha
TERMINAL - USERNAME - PASSWORD
Hung Hua Hotel - User: msuen - Pass: oleander
Alice Gardens Pod 1 - User: asgarden - Pass: rbbthole
The Hive - User: bbao - Pass: vanguard
The Hive - User: wbees - Pass: paperfan

Tay Zong Medical
TERMINAL - USERNAME - PASSWORD
Pool - User: poolrm - Pass: pelagic
F1 - User: lgeng - Pass: gehong
F3 - User: zarvlad - Pass: muonrule
F3 - User: rkumar - Pass: outback
F4 - User: nemuni - Pass: ironfist
F4 - User: tymmf - Pass: ebrain
F4 - User: gengl - Pass: pangutym

Picus
TERMINAL - USERNAME - PASSWORD
F3 - User: mwells - Pass: lavadome
F3 - User: jricard - Pass: macro
F3 - User: atresman - Pass: skylark
F3 - User: sbernard - Pass: dumbass
F6 - User: jkenney - Pass: montroyal
F6 - User: dgassner - Pass: oneida
Restricted Area F1 - User: pcorbo - Pass: spitfire
Restricted Area F1 - User: bshupper - Pass: widget
Restricted Area F1 - User: jchapman - Pass: diode
Restricted Area F1 - User: jchapman - Pass: diode
Restricted Area F2 - User: emasse - Pass: moufette
Restricted Area F2 - User: bnorthco - Pass: sterling
Restricted Area F3 - User: ltodd - Pass: titom

Detroit Convention Center
TERMINAL - USERNAME - PASSWORD
F3 - User: wtaggart - Pass: marjorie

Harvester
TERMINAL - USERNAME - PASSWORD
Territory B1 - User: zhengl - Pass: hirollr
Territory B2 - User: ttong - Pass: mirrshds

Hengsha Seaport
TERMINAL - USERNAME - PASSWORD
Seaport F2 - User: prmtr01 - Pass: collosus
Seaport F3 - User: jwang - Pass: mainman

Omega Ranch
TERMINAL - USERNAME - PASSWORD
F1 - User: dfalk - Pass: topfrag
F1 - User: eblake - Pass: hndstuth
F1 - User: dabblett - Pass: monastic
F1 - User: ogomez - Pass: techsmex
F1 - User: lmorano - Pass: morpheus
F2 - User: aoconnor - Pass: keppler
F2 - User: pwalts - Pass: ruckus

Panchaea
TERMINAL - USERNAME - PASSWORD
Port of Entry - User: kathys - Pass: mssinghme
Landing Pad - User: amelie - Pass: lstforever
Hyron Project - User: hualing - Pass: iwntlove
Hyron Project - User: daiyu - Pass: frgottn
Hyron Project - User: marilyn - Pass: yyyyyy
Tower - User: isabella - Pass: rhemmberme

Complete the prologue and begin the first level. Enter the warehouse and search for cardboard boxes marked with "Sarif Industries" to find a QR barcode. Scan it on a QR readable phone to view a fictional website from the storyline.

-In the Detroit police station can be found one officer that may seem particularly familiar.

-Robocop's human precursor was named 'Alex Murphy,' and the guy talking about 80s movies at the desk has the same name.