Key Items

Key items are a staple element of the Tomb Raider Series. Their obvious function is to unlock doors/areas that are inaccessible, and progress the story.

Original Timeline
The Original Timeline, uses traditional keys, key-cards, and objects that must be placed in the correct location.

Tomb Raider

 * Gold Idol
 * Silver Key
 * Machine Cog (x3)
 * Atlas Key
 * Damocles Key
 * Thor Key
 * Neptune Key
 * Rusty Key
 * Rusty Key (x2)
 * Silver Key (x2)
 * Gold Key
 * Rusty Key (x2)
 * Gold Key (x2)
 * Saphire Key (x2)
 * Saphire Key
 * Ankh
 * Eye of Horus
 * Scarab
 * Seal of Anubis
 * Gold Key
 * Ankh (x2)
 * Scarab
 * Fuse (x3)
 * Pyramid Key

Unfinished Business

 * Gold Key
 * Ornate Key (x7)

Tomb Raider II

 * Guardhouse Key
 * Rusty Key
 * Boathouse Key
 * Steel Key
 * Iron Key
 * Library Key
 * Detonator Key
 * Ornate Key (x2)
 * Relay Box
 * Circuit Board
 * Yellow Pass Card
 * Red Pass Card (x2)
 * Green Pass Card
 * Blue Pass Card
 * Machine Chip
 * Restroom Key
 * Circuit Breaker
 * Rusty Key
 * Cabin Key
 * Theatre Key
 * Stern Key
 * Cabin Key
 * Storage Key
 * Seraph
 * Drawbridge Key
 * Hut Key
 * Main Hall Key
 * Strongroom Key
 * Rooftops Key
 * Trapdoor Key
 * Gemstones (x2)
 * Prayer Wheel (x5)
 * Tibetan Mask (x3)
 * Gong Hammer
 * Talion
 * The Dragon Seal
 * Gold Key
 * Silver Key
 * Main Chamber Key
 * Mystic Plaque (x2)
 * Mystic Plaque
 * Gun Cupboard Key

The Golden Mask

 * Guardroom Key
 * Shaft B Key
 * Circuit Board
 * CardKey 1 (x2)
 * CardKey 2
 * Gold Nugget
 * Hotel Key (x2)
 * Door Circuit
 * Elevator Junction

Tomb Raider III: Adventures of Lara Croft

 * Racetrack Key
 * Indra Key
 * Key of Ganesha (x5)
 * Scimitar (x2)
 * Gate Key (x2)
 * Smuggler's Key
 * Serpent Stone (x3)
 * Swamp Map
 * Commander Bishop's Key
 * Lt. Tuckerman's Key
 * Detonator Switch
 * Generator Access
 * Keycard Type A
 * Keycard Type B (x2)
 * Blue Security Pass
 * Yellow Security Pass (x3)
 * Code Clearance Disk (blue)
 * Hangar Access Key
 * Launch Code Pass
 * Code Clearance Disk (green)
 * Flue Room Key
 * Cathedral Key
 * Maintenance Key
 * Old Penny
 * Ticket
 * Solomon's Key (x2)
 * Masonic Mallet
 * Ornate Star
 * Embalming Fluid
 * Boiler Room Key
 * Gate Control Key
 * Hut Key
 * Crowbar
 * Lead Acid Battery
 * Winch Starter
 * Oceanic Mask (x4)
 * Uli Key (x2)
 * Vault Key

The Lost Artifact

 * Crowbar
 * Thistle Stone (x2)
 * Crowbar
 * Cairn Key
 * Drill Activator Card
 * Pump Access Disk
 * Circuit Bulb (Yellow)
 * Circuit Bulb (Blue)
 * Mutant Sample (Red)
 * Mutant Sample (Green)
 * Zoo Key
 * Aviary Key (x2)

Tomb Raider IV: The Last Revelation

 * Eye Piece (x2)
 * Eye of Horus
 * The Timeless Sands
 * Amulet of Horus
 * The Hand Of Orion
 * The Hand Of Sirius
 * Scarab Talisman
 * The Golden Serpent
 * Ignition Key
 * Canopic Jar 1
 * Canopic Jar 2
 * Hypostyle Key
 * Sun Goddess
 * Sun Disk
 * Sun Talisman
 * The Rules of Senet
 * Cartouche Piece 1
 * Cartouche Piece 2
 * Ba Cartouche
 * Ra Cartouche
 * Golden Vraeus
 * Guardian Key
 * Torch
 * Crowbar
 * Laser Sight
 * Token
 * Broken Handle
 * Wall Hook
 * Hook and Pole
 * Gate Key
 * Trident (x4)
 * Left Gauntlet
 * Golden Star (x3)
 * Horseman's Gem
 * Fire Circle Scroll
 * Pharos Pillar
 * Music Scroll
 * Pharos Knot (Hall of Demetrius)
 * Broken Glasses
 * Black Beetle (x4)
 * Broken Beetle (x2)
 * Winding Key
 * Mechanical Scarab
 * Mechanical Scarab With Key
 * Pharos Knot (Cleopatra's Palaces)
 * Hathor Effigy
 * Ornate Handle
 * Portal Guardian
 * Right Gauntlet
 * Right Greave
 * Left Greave
 * Breast Plate
 * Nitrous Oxide Cannister
 * Valve Pipe
 * Nitrous Oxide Feeder
 * Weapon Code Key
 * Roof Key
 * Handle
 * Car-Jack Body
 * Car-Jack
 * Mine Detonator Body
 * Mine Position Data
 * Mine Detonator
 * Silver Key
 * Metal Blade
 * Wooden Handle
 * Shovel
 * Scrap of Paper
 * Stone of Atum
 * Stone of Khepri
 * Stone of Maat
 * Stone of Re
 * Holy Scripture (x4)
 * The Guards Keys
 * Armoury Key
 * Jerrycan
 * Bag of Sand
 * Small Waterskin
 * Western Shaft Key
 * Northern Shaft Key
 * Southern Shaft Key
 * Eastern Shaft Key
 * Large Waterskin

Tomb Raider Chronicles

 * Mercury Stone
 * Golden Key 1
 * Laser Sight
 * Garden Key (x2)
 * Saturn Symbol
 * Crowbar
 * Laser Sight
 * Golden Coin
 * Mars Symbol
 * Valve Wheel
 * Venus Symbol
 * Gemstone Piece
 * Gemstone Piece
 * Gemstone
 * Colosseum Key 1
 * Colosseum Key 2
 * Philosopher's Stone
 * Silver Key (x2)
 * Swipe Card
 * Laser Sight
 * A Fuse
 * Crowbar
 * Battery (-)
 * Bronze Key
 * Silver Key
 * Aqualung
 * Battery (+)
 * Suit Console
 * Suit Battery
 * Chaff Flares
 * Spear of Destiny
 * Swipe Card
 * Silver Key
 * Bronze Key
 * Nitrogen Canister
 * Oxygen Canister
 * Rubber Tube
 * Pitchfork
 * Catapult
 * Iron Clapper
 * Torch
 * Heart
 * Bone Dust
 * Bestiary
 * Chalk
 * Silver Coin
 * Hammer
 * High Level Access Card
 * Access Code Disc
 * Cloth (x2)
 * Bottle of Chloroform (x6)
 * Chloroform Soaked Cloth
 * Iris Lab Access
 * Iris Artifact
 * Restroom Access Card
 * Teleporter Disc
 * Key Bit (Left)
 * Key Bit (Right)
 * Helipad Access Key

Tomb Raider: The Angel of Darkness

 * Gantry Gate Key (Parisian Back Streets)
 * Lift Maintenance Key
 * Apartment 21 Key
 * Ex-Janitor's Key
 * Bartender's Key
 * Ticket Office Key (x2)
 * Louvre Low Security Pass
 * Louvre Guard's Key
 * Carvier's Security Pass
 * Cellar Key
 * Strahov Low Security Pass (x2)
 * Strahov High Security Pass
 * Botanical Low Access Pass
 * Botanical High Access Pass
 * Botanical Medium Access Pass
 * Strahov Assistant's Pass
 * Sanitarium Low Access Pass
 * Sanitarium Medium Access Pass

Legend Timeline
The legend timeline again uses traditional keys, and relics that must be placed in the correct location, however they may also require the use of puzzles to complete them in Tomb Raider Underworld.

Tomb Raider Anniversary

 * Village Key (Peru - City of Vilcabamba)
 * Cog (Peru - The Lost Valley)
 * Key of Hephaestus (Greece - St. Francis Folly)
 * Key of Damocles (Greece - St. Francis Folly)
 * Key of Atlas (Greece - St. Francis Folly)
 * Key of Poseidon (Greece - St. Francis Folly)
 * Balcony Key (Greece - The Coliseum)
 * Seal of Anubis
 * Ankh of Isis
 * Scarab of Osiris
 * Eye of Horus
 * Ankh Key (Egypt - Sanctuary of the Scion) (x2)
 * Red Fuse (Lost Island - Natla's Mines)
 * Blue Fuse (Lost Island - Natla's Mines)
 * Green Fuse (Lost Island - Natla's Mines)

Tomb Raider: Underworld

 * Handles
 * Shiva Gems (x2)
 * Jaguar Head
 * Stone Headdress
 * Rattling House Key
 * Flame House Key
 * Jaguar House Key
 * Razor House Key
 * Helheim Power Stone (x4)

Lara Croft GO

 * The Key of Snakes
 * The Key of Stones
 * The Key of Spirits

Tomb Raider
Tomb Raider doesn't use traditional keys as previous timelines did. It instead opts for having items that must be given to characters, or brought to a certain location for the story to continue. With the exception of the Axe which is used to pry open doors, and the shotgun and grenade launcher which can destroy wooden and steel barriers respectively, to allow access to blocked areas.
 * Roth's Pack
 * Radio Transmitter
 * Tackle
 * Tools

Rise of the Tomb Raider
Much like the previous game, the areas are locked behind gear acquirement.
 * Rope Arrow
 * Explosives
 * Wire Spool
 * Broadhead Arrowheads