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
 * Drawbridge Key
 * Hut Key
 * Main Hall Key
 * Strongroom Key
 * Rooftops Key
 * Trapdoor Key
 * Gemstones
 * Prayer Wheel
 * Tibetan Mask
 * Gong Hammer
 * The Dragon Seal
 * Gold Key
 * Silver Key
 * Main Chamber Key
 * Mystic Plaque (x3)
 * 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)
 * Detonator Switch
 * Generator Access
 * Blue Security Pass
 * Boiler Room Key
 * Cathedral Key
 * Code Clearance Disk (blue)
 * Code Clearance Disk (green)
 * Commander Bishop's Key
 * Embalming Fluid
 * Flue Room Key
 * Gate Control Key
 * Hangar Access Key
 * Hut Key
 * K4
 * Keycard type A
 * Keycard type B
 * Launch Code Pass
 * Lead Acid Battery
 * Lt. Tuckerman's Key
 * Maintenance Key
 * Masonic Mallet
 * Oceanic Mask
 * Old Penny
 * Ornate Star
 * Serpent Stone
 * Smuggler's Key
 * Solomon's Key
 * Swamp Map
 * Ticket
 * Tower Access Key
 * Uli Key
 * Vault Key
 * Winch Starter
 * Yellow Security Pass

The Lost Artifact

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

Tomb Raider IV: The Last Revelation

 * Winding Key
 * Armoury Key
 * The Guards Keys
 * Northern Shaft Key
 * Southern Shaft Key
 * Eastern Shaft Key
 * Western Shaft Key
 * Ignition Key
 * The Hand Of Orion
 * The Hand Of Sirius
 * Scarab Talisman
 * Golden Serpent
 * Eye of Horus
 * Silver Key
 * Golden Vraeus
 * Guardian Key
 * Hypostyle Key
 * Temple Key
 * Roof Key
 * Weapon Code Key
 * Golden Star
 * Portal Guardian
 * Horseman's Gem
 * Pharos Knot
 * Pharos Pillar
 * Gate Key
 * Stone of Atum
 * Stone of Khepri
 * Stone of Maat
 * Stone of Re

Tomb Raider Chronicles

 * Golden Key 1
 * Garden Key (x2)
 * Saturn Stone
 * Gold Coin
 * Mars Stone
 * Valve Wheel
 * Venus Stone
 * Colosseum Key (x2)
 * Silver Key (x2)
 * Swipe Card
 * Bronze Key
 * Silver Key
 * Swipe Card
 * Silver Key
 * Bronze Key
 * Demon's Heart
 * High Level Access Card
 * Access Code Disc
 * Iris Lab Access
 * Iris
 * Restroom Access Card
 * Teleporter Disc
 * Helipad Access Key (created by combining Key Bit (left) and Key Bit (right)

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.
 * Robe Arrow
 * Explosives
 * Wire Spool
 * Broadhead Arrowheads