Below is a list of several things that you will need to get in order to have fun and keep yourself alive

AP Sensor
A sensor that detects life forms. It tells you by making a vibration on the Dual Shock controller, the closer an enemy is the harder it vibrates. Not many people use this because they tend to shoot guards, however, the idea of the game is to be stealthy and not make contact which this item helps with.

Bandage
Stops Bleeding. When your life gauge is orange you are bleeding so use one of these. Using a bandage stops the bleeding and stops any blod trails for enemies to follow. Another way to stop bleeding is to crouch, however, you don't always have time to do this.

B.D.U (Battle Dress Uniform)
Same attire as the guards in the Shell 1 Core. Can't be used on it's own otherwise it won't work you must have an AKS-74u equipped. Be careful not to run into guards as the disguise will suddenly come off. (Great clothing to wear durring the whole Big Shell mission. Not only does it look cool, but it has several pockets and weapons attached to it, giving a more realistic sense to where Raiden keeps all his weapons and items.)  

Body Armour
Cuts down amount of damage recieved from bullets. This is rear and can be found if you look. Over excessive use of the body armour will lead to a dissintergration of how much it cuts down on. Too much and it will be pretty useless. I suggest you leave it off until the final battle and perhaps the Tengu barricades. (Looks really cool when its equiped in the Arsenal chapters, along with the H.F blade, makes Raiden look more deadly and battle-ready) 

Book
Magazine featuring scantilly clad women used to distract guards from their patrol. No you can't look through it but it comes in very handy in certain situations. Press square to put it on the floor. You can't pick up a book once you have put it down.

Box
There are various types of box throughout the game including a Zone of the Enders one. You can move around whilst under it and there is a hole to look out through when in first person. They are particularly useful for hiding in however if you use a wrong box in the wrong place the guard may become suspicious i.e don't use a "ZOE" box where there are "Orange" boxes. If a guard is suspicious and is about to tip over the box continually press square to end up getting him into a strangle hold.

Camera
Used in the tanker mission to take pictures. It can hold 8 pictures and you can overwrite old one's if you have to many the camera will automatically overwrite one. As Snake doesn't have a scope this can be used in it's place as it has a zoom feature.

Cigs
Snake's lucky charm. Can be used to see lasers and calm him with the same effect as Pentaze. Reduces his health however it will not completely kill him.

Coolant
It may be in the weapons list on the game but i don't consider it a weapon i consider it an item so it's here not in weapons. Used to disarm bombs, wake up sleeping guards, get rid of bugs and put out fires.

D. Mic (Directional Microphone)
The D. Mic amplifies sound by over 100x and is powerful enough to hear a person's heart beat and even their pacemaker! It also has the ability to penetrate walls and obstructions to focalize on conversations, but it only covers a limited distance. To hear the conversation properly you must the D. Mic to where the person is standing.

Dog Tags
You collect these identification tags from guards throughout the game. They are used to get bonus items after completing the game. To find out if you have a person's dog tags equip the camera/scope and hold triangle, if you have their dog tags it will show their name.

Level Key Cards
Throughout the game you are given various level key cards, these allow you to enter certain rooms giving you access to more weapons and items.

Magazine
Same as coolant spray I consider it an item so it's here. These are used to distract guards by throwing them. It could be used as a weapon to throw at a guard but will it have any effect? I don't think so.

Medicine
A flu remedy. If Snake/Raiden begin to sneeze quickly take this medicine as it will help before the sneezing gives you away. There is not so much need for it on the easier difficulties however in Hard, Extreme and in European Extreme you can get cold's very easily.

Mine Detector
Detects claymore mines and shows them on your radar in yellow. Crawl over them to pick them up and save giving yourself away and recieving damage.

MO Disk
A virus modeled after the FOXDIE virus program. This disk was written by Emma. it effectse the Arsenal AI. Only Emma knows how to use it so it has no use to you apart from to advance in the game.

N.V.G (Night Vision Goggles)
Found quite late in the game in the flooded corridors at the B2 level of the Shell 2 Core. Helps to see in the dark. No real use for them.

Skull Mask (Night Vision Goggles/Oxygen Tank)

Ok, not really considered to be an item, but the mask is equiped with two IR eye pieces and oxygen mouth piece which gives a greater oxygen meter. This was suppose to help Raiden see throughout the Big Shell if it were a dark place, but after realizing the lights in the struts are functioning, he ditches the mask quite early in the game. (Having this mask on, which completes Raiden's Skull Suit, gives him the appearance of the Symbiote Spider-Man!)

Pentazemin
Used in conjunction with the PSG1/PSG1-T to ease the shaking that Raiden is subject to and helps a lot with accuracy.

Phone
No real use. Cyborg Ninja/Mr.X gives it to you to help you out well in trouble. Basically if you can't work out that you should get rid of bugs and put out the fire with the coolant you get a text message telling you to use it.

Ration
Recovers health. If you have it equipped and your life drops to 0 then it will automatically boost your health. (Always equip it as a default)

Scope
Basically a pair of binoculars which have a zoom feature. You can also use this to check whether you have somebody's dog tags. Circle to zoom in, X to zoom out. You can;t move whilst these are equipped.

Sensor A & B
Used to detect bombs and made by Stillman. Sensor A detects Fatman's scented bombs, Sensor B detects Fatman's odourless bombs. Bomb's show up as a yellow area on the Radar.

Shaver
On Substance it's only available in Hard, Extreme and European Extreme,  in the first room where you are Raiden there is an electronic shaver found near the diving suits that Raiden will give to Pliskin later in the game. This will cause Pliskin/Snake to have a clean shaven look later in the game.

Thermal Goggles
These can detect heat via infrared waves. You can see guards from a distance, lasers, claymores etc. They can also be used to check for dog tags as they will show up as black over the guards red body.

SOCOM Supressor

This is a little tricky.  It's in Strut F - Warehouse. Go to the bottom floor.
If you go south on the bottom floor of the warehouse, you will see a hallway
with a door on the right and a door on the left. Take the one on the left
(you need a lvl. 1 card). Go into FPV (first person view) or use your binoculars to look around the bottom of the wall. You should see an air duct lookin thing. Crawl through that and you should end up in the other room. The suppressor should be floating right in front of you.

USP Supressor

Beat the game and then save. Start a new game with the saved info. Go to the Navigation Deck after you defeat Olga. Go to the place where you recieve the Thermal Goggles and you should find this weapon on the middle platform.

AKS-74u Supressor

This is found near around the battle area (or what's left of it) after the Harrier battle. Get on the pipe and few on the side of you for it. If you see it, you will have to flip to the side to get it. (This may take a couple tries before you cana ctually get over there without falling to a watery grave)

Olga Gurlukovich (Solid Snake)

On board the Tanker, Solid Snake spots a women soldier speaking to the terrorists by radio. He goes out and holds her up at gun point. As the Tanker turns and the rain stops, Olga and Snake challenge the other in a battle of skill in combat.

I suggest the first two things you do should be to take out the light and green tarp. The best thing to do is confuse Olga. Whilst she is running toward the back or hiding behind a box quickly roll to the opposite side and hide. She will continue to shoot at the place where you were and you can then have a clean shot.

Note: You cannot take out the light or green tarp on extreme and european extreme modes!

Corridor Shootout (Solid Snake)

While walking through the corridors of the Discovery Tanker, Snake takes cover as a group of terrorists patrol the very corridor Snake is on, and they intend to guard it with their lives. As they walk closer, Snake grips his gun and gets ready for a fight to the death as the terrorist's scream "Who goes there?!?"

When the shoot out first begins, get to the nearest box as soon as possible. When the guards start shooting, peek around the corner of the box and throw a stun gernade (if you have any). That should take care of the first three guards (maybe even the grenade guard in the back if you time it right). After this happens three more guards come running at you, get out your USP and blast away until only their blood spilling from their bodies is the only thing moving besides you.

Fortune (Raiden)

		TANKER CHAPTER
EASY	NORMAL	HARD	VERY HARD	EXTREME
000 Olga Gurlukovich	000 Olga Gurlukovich	000 Olga Gurlukovich	000 Olga Gurlukovich	000 Olga Gurlukovich
001 Ross E Bowman	001 Nicholas M Capone	001 Kazuya Ikeno	001 Markus A Lindqvist	001 Sanae Shintani
002 Adraham Carrillo	002 Donal L Gilliland	002 Kumi Sato	002 Kenichi Takashima	002 Aki Hitachi
003 Kaissar Ag Agnouche	003 Joe T Holden	003 Toshio Noguchi	003 Tiago S Parra	003 Mathieu Trepanier
004 Aranud delaunay	004 Shaun P Wilson	004 Chul Kwon	004 Chris J Matzdort	004 Yoshinori Onodera
005 Ryoji Makimura	005 Jeff K Hui	005 Hirosuke Moritomo	005 Adriaan B Scholvinck	005 Joshua D Casnocha
006 kim K Christensen	006 Nobuyoshi Nishimura	006 Hoshiko Kamata	006 Julius Jun	006 Louis K Stevenson
007 Kevin S Purvis	007 Tomomi Kato	007 Marco G Brunato	007 Kazuki Nisimura	007 Michael D Rogers
008 Yasuhiro Miyamoto	008 Anders E Leiro	008 Jesus Bidian Jr	008 Zhang Chao	008 Gianluca Peruzzo
009 Michael C Anthony	009 Skraktus Mercio	009 Jordi C Aidea	009 Vishal Kapur	009 Travis J Lujan
010 Carlos Garci Garcie	010 Gavin S Nash	010 Sadaaki Kaneyoshi	010 Victor A Cruz	010 Brendan M Randall
011 Mineshi Kimura	011 David S Eastwick	011Anthony D Callaghan	011 Larry D Lionderger	011 Chris D Bernd
012 Jonathan Hancock	012 Kozaka Kh Henri	012 Craig M Weldon	012 Celeste D Sauls	012 Chantelle M Blair
013 Bryn T Kershaw	013 Gackt	013 Daizo Shikama	013 Danielle E Ford	013 Eduard V Fernandez
014 Michl Hurkmans	014 Thomas P Dohm	014 Shinta Nojiri	014 Jennifer A Mauck	014 Yoji Shinkawa
015 Ken Ogasawara	015 Enrique Camacho	015 Jun Tanaka	015 Daniel A Olsson	015 Niko lonixx Horn
016 Petro Kyrylenko	016 Takashi Ohari	016 Bernard A Reeves	016 Achim Amann	016 Adnan Hadzic
017 Aaron F Kopf	017 Max C Wood	017 Evan M Martin	017 Sean P Cullen	017 Shu Tajima
018 James P Fitzgibbons	018 John W Fleming	018 Bruno A Montenegro	018 Tommy Blunt	018 Stuart J Batchelar
019 Alexander Strigl	019 Edward B Elston	019 Almerindo Lemke	019 David Chau	019 Masataka Nishiyama
020 Dave Cox	020 Chiristopher D Dadah	020 Satoshi Hirai	020 Philippe Ah Mourizen	020 Michael M Wong
021 Cory A Noll	021 Rodrigo Spinetti	021 Justin C Cumley	021 Yoko Niiyama	021 Manabu Nakamura
022 Andreas Edeler	022 Frank Gther	022 Kristian Lindin	022 John V Teves	022 Simon P Sargenl
023 Gary J Davidson	023 James N Janovsky	023 Mika Abe	023 Shintaro Naka	023 Yosuke Kamezaki
	024 Abigail G Sanchez	024 Tatsuya Takada	024 Natsuyo Tanaka	024 Clarke A Baldwi
	025 Rafael Estaregue	025 Pawel Majewski	025 Yuji Korekado	025 Hideki Sasaki
		026 Mark W Bruce	026 Bryan D Sceide	026 Ho Yeung Tsang
		027 Youssef Fassi-Fihri	027 Yukho Wong	027 Ulf T Lundh
		028 Christian Noerstr	028 Lars Crama	028 Christopher J Uzdanovich
		029 Hiro Miyajima	029 Jonathan Murphy	029 Alex C Wilson
		030 Nathaniel Lord	030 Gary K Yong	030 Michael A Hare
		031 Carlos Kiho	031 Yuki Miyama	031 Andrew N Bartleft
		032 Tim U Chan	032 Evan A Ball	032 liro Karvinen
			033 Jason B Wray	033 Marcin A Cieslinski
			034 Andrew J Baker
		PLANT CHAPTER
EASY	NORMAL	HARD	VERY HARD	EXTREME
000 Iroquois Pliskin	000 Meryl SilverBurgh	000 Solid Snake	000 Liquid Snake	000 Hideo Kojima
001 Hiro Tanaka	001 Thomas G Cardner	001 Sotaro Tojima	001 Yamato Hagiwara	001 Takeshi Sato
002 Cinton J Heileman	002 Matthew R Vogel	002 Christophe L Lallemand	002 Christoph Walker	002 Shinji Yamashita
003 Mike J Newman	003 Megumi Nakaniihara	003 Hurell F Lyons	003 Brian D Hagermann	003 Ryan T Cronkright
004 Rayyan A Said	004 Matthw A Bullock	004 Juntaro Saito	004 Makoto Sonoyama	004 Josef Karsch
005 Shigeo Okajima	005 Addam J Drew	005 SoToyota	005 Christoph C Reinicke	005 Emmanuel Y Passian
006 Cord B Smith	006 Yusuke Takada	006 Robert J Bryk	006 Justin D Edersole	006 Lee M Mccowen
007 Mario C Lopez	007 Miles D Ashley	007 Scott A Morgan	007 William A Catacutan	007 Hironobu Matsui
008 Shuhei Tanaka	008 Mark E Francis	008 Geoge T Joseph	008 Natalie Yip	008 Drew J Mlmer
009 Momoko Kawai	009 Kazuki Muraoka	009 Vahe V Varujan	009 Kelsy L Clark	009 Toru Kawakami
010 Kengo Iwata	010 Tom A Hutchinson	010 Mark Mugendi	010 Bjoern Heide	010 Adam J Sarpolis
011 Daniel Modol	011 Corey E Louden	011 Irene C Carvalho	011 Daniel Y Kato	011 Jyunpel Hirano
012 Noriyuki Katsumura	012 Ian J Andrews	012 Jools Watsham	012 Alexander Reis Cunha Dantas	012 Kyle S Carrigan
013 Tetsuro Sueyoshi	013 Tim J Veldboom	013 Adam J Schack	013 Jason Enos	013 Matt J Van Leeuwen
014 Tony J Ylaranta	014 David C Ratanaseangsuang	014 Takayoshi Ogawa	014 Josiah F Tsuchida	014 Matthew B Boyett
015 Paul R Martin	015 Shiro Mukaide	015 Jamie A Trumper	015 Yoshikazu Matsuhara	015 Collis R Williams
016 Leandro M Cardoso	016 Rie Nishiki	016 Sergio Carranza	016 Claudia Cd Diessner	016 Nobumitsu Tanaka
017 Al J Josef	017Mariko Nakamura	017 Michiko Arai	017 Hiroyuki Tsuchida	017 Matthew C Miller
018 Kyoko Hariyama	018 Emily Britt	018 Takashi Mizutani	018 Devan V Tailor	018 MAsashi Watanabe
019 Barna K Olvedi	019 Daniel A Longworth	019 Christian Cr Renner	019 Chris Kramer	019 Yoshiyuki Koido
020 Yuta Kunide	020 Caroline M L Gibson	020 Andy B Gilcer	020 Ikuya Nakamura	020 Tsunehiko Shibata
021 Daniel C Bell	021 Yuki Sawada	021 Takashi Horikawa	021 Takaaki Kitamura	021 Ryan C Sheffer
022 Takahiro Owari	022 Daijiro Takeshima	022 Kevin T Petty	022 Ryoko Yoshimura	022 Carlos X Luna
023 Nadim Dadan	023 Masatoshi Uehara	023 Guilherme K Saran	023 Yoshiteru Kobayashi	023 David A Ginepri
024 Timothy J Kane	024 Ikki Sakakibara	024 Chan Yen Wen	024 Chris M Flohr	024 Emmanuel Phung
025 Allen J Chang	025 Juergon Jur Goessnitzer	025 Caroline Frechette	025 Nicholas J Schreiber	025 Ryosaku Ueno
026 Jean Luc Cougar	026 Yuko Yano	026 Daisuke Mogi	026 Kenichiro Kano	026 Alan J Harries
027 Luis A Fernandes	027 Rick Naylor	027 Tomokazu Fukushima	027 Hiroki Satoyoshi	027 Marco O Scherrer
028 Yuta Kiguchi	028 Jeremy A Davis	028 Monte S Tale	028 Shuyo Murata	028 Edmond V To
029 Masafumi Okuta	029 Zephan G Kirkpatrick	029 Stephanie Hattenberger	029 Futoshi Satou	029 Chevrinais Thomas
030 Matthew R Bartz	030 Kenneth Wong	030 Koichi Nakano	030 Shinpei Murakami	030 Hiroshi Yokote
031 Kunio Takabe	031 Michael D Craft	031 Matt T Federspiel	031 David A Lesslie	031 Berl B Pottstam
032 Joey Simkins	032 Stephan D Haynes	032 Sachiko Hara	032 Brian R Strack	032 Kenichiro Shigeno
033 Sve G Westli	033 Joshua A Crandoll	033 Ray A Holdren	033 Skip M Murray	033 Kaori Yamada
034 Sam M Shrimpton	034 Hiroyuki Inoue	034 Carlos I Siu	034 Axel R Zijderveld	034 Ryan J Crane
035 Norihiko Hibino	035 Andrew J Walker	035 Eric G Macway	035 Kamran Keenan	035 Gareth J Lewis
036 Erik R Christy	036 Kazunobu Uehara	036 Ian J Roberts	036 Tomonori Morita	036 Andreas R Ramsauer
037 Jason C Patino	037 Thomas Szedlak	037 Alexander Berteand	037 Julien Jd Dort	037 Justin A Cagle
038 Maarten Van Der Zwan	038 Shuichi Hata	038 Peter D Mccarthy	038 Steven Schmizu	038 Christopher S Korte
039 Motoyuki Yoshioka	039 Frank A Morales	039 Ichiro Kutome	039 Michael O Kress	039 Masahiro Yoshinaga
040 Adrian Thien	040 Lee P French	040 Yutaka Negishi	040 Stephane Tudela	040 Daisuke Nishimura
041 Yuki Higuchi	041 Marcos A Gomez	041 Renata N Csio	041 Yoriko Shimizu	041 Viana Siles Mauricette
042 Peter Stillman	042 Scott K Cleary	042 Tony J Case	042 Yun-Ho Kim	042 Chan Yung Kok
	043 Peter Stillman	043 Paul M Blacketer	043 Jun Sukegawa	043 Anthony J Barritt
		044 Dannis J Krimpeldein	044 Joey P Gonzales	044 Kaori Yae
		045 Stanley A Garcia	045 Christopher Heck	045 Isao A Sato
		046 Charles P Quivers	046 Martin Kukowka	046 Ryan J Schettle
		047 Sevak N Fair	047 Alex N Martinez	047 Andy Lam
		048 Peter Stillman	048 Satoru Kobayashi	048 Hiroaki Yoshiike
			049 Giovanni Cavalliere	049 Cebric Krolikowski
			050 Gabriel Freitas Peres	050 Sebastian J Pitman
			051 Peter Stillman	051 Mark A Matuszewski
				052 Xavier R Garcia
				053 Peter Stillman