Card Combos are combinations of cards that can unlock a clue. There are a total of 40.
- 11 cards are from Cahill card packs from the books. These are further discussed on their book articles.
- 10 more card combos unlock a clue that can also be unlocked through missions.
- 19 card combos that are the only way to unlock certain Clues.
Book Card Combos[]
The Maze of Bones Card Combo[]
- Card 1: Surveillance Camera
- Card 2: Dan Cahill
- Card 3: Catacombs
- Card 4: The Titanic
- Card 5: George McClain
- Card 6: Thomas Jefferson
One False Note Card Combo[]
The Sword Thief Card Combo []
- Card 33: Samurai Saladin
- Card 34: Uncle Alistair Oh
- Card 35: Hope Diamond
- Card 36: Grace's Passport
- Card 37: Jean-Baptiste Tavernier
- Card 38: Yakuza Tattoo
Beyond the Grave Card Combo[]
- Card 74: Irina Spasky
- Card 75: Grace's Guidebook
- Card 76: The Myrrh Tree
- Card 77: Secrets of Budapest
- Card 78: Sakhet
- Card 79: David Livingstone
The Black Circle Card Combo[]
- Card 90: Hamilton Holt
- Card 91: Kremlin Surveillance
- Card 92: Simon Bolivar
- Card 93: The Amber Room
- Card 94: Anastasia
- Card 95: Police Report
In Too Deep Card Combo[]
- Card 106: Nikola Tesla
- Card 107: Irina Spasky
- Card 108: Earhart's Notes
- Card 109: The Flying Lemur
- Card 110: The Missing Element
- Card 111: Anak Krakatau
The Viper's Nest Card Combo[]
- Card 145: Eisenhower Holt
- Card 146: Shaka Zulu
- Card 147: Antarctic Bling
- Card 148: Bead Cipher
- Card 149: Prison Number 4
- Card 150: The Fallen Agent
The Emperor's Code Card Combo[]
- Card 161: Lollipop Jonah
- Card 162: Everest Rescue
- Card 163: Nellie's Lie
- Card 164: Xian Surveillance
- Card 165: The Nudelmans
- Card 166: George Mallory
Storm Warning Card Combo[]
- Card 208: The Man in Gray
- Card 209: Pirate Natalie
- Card 210: Lock Box
- Card 211: Bermuda Stronghold
- Card 212: Anne Bonny
- Card 213: Stolen Letter
Into the Gauntlet Card Combo[]
- Card 220: The Last Chance
- Card 221: The Long Shot
- Card 222: The Wild Card
- Card 223: The Loose Cannon
- Card 224: The Double-Crosser
- Card 225: The Backstabber
Vespers Rising Card Combo[]
- Card 254: The Newest Target
- Card 255: The Superdweeb
- Card 256: Footprint
- Card 257: Gideon's Ring
- Card 258: Vesper's Armor
- Card 259: Vesper Transmission
Mission Card Combos[]
Mission 0: Agent Training Card Combo Both this combo and Mission 0 unlock Uranium.
Mission 1: The Lost Clue Card Combo[]
Both this combo and Mission 1 unlock Phosphorus.
- Card 4: The Titanic
- Card 5: George McClain
- Card 15: Telegram
- Card 27: Loch Ness
- Card 49: Paul Addison
Mission 2: The Emperor's Secret Card Combo[]
Both this combo and Mission 2 unlock King Cobra Venom.
Mission 3: The Lost Diamond Card Combo[]
Both this combo and Mission 3 unlock Zinc.
- Card 7: Maria Marapao
- Card 24: Lilya Chernova
- Card 35: Hope Diamond
- Card 37: Jean-Baptiste Tavernier
- Card 55: The Golden Fleece
Mission 4: The Lucian Fort Card Combo[]
Both this combo and Mission 4 unlock Clover.
- Card 77: Secrets of Budapest
- Card 113: Chrissy Collins
- Card 118: Locked Up
- Card 120: Crown of St. Stephen
Mission 5: The General's Clue Card Combo[]
Both this combo and Mission 5 unlock Lead.
- Card 89: Jonah's Journal
- Card 92: Simon Bolivar
- Card 121: The Emperor's Promise
- Card 122: Mateo Sanchez
Mission 6: The Mad Scientist's Clue Card Combo[]
Both this combo and Mission 6 unlock Mercury.
- Card 81: Leslie D. Mill
- Card 98: Thomas Edison
- Card 100: The Sabotaged Lab
- Card 106: Nikola Tesla
- Card 119: Airport Security
Mission 7: The Frozen Secret Card Combo[]
Both this combo and Mission 7 unlock Magnesium.
- Card 147: Antarctic Bling
- Card 155: South Pole
- Card 186: The Lost Expedition
- Card 190: Sir John Franklin
- Card 192: North Pole
- Card 195: Antarctic Arnold
Mission 8: The Desert Sabotage Card Combo[]
Both this combo and Mission 8 unlock Silver.
- Card 170: T.E. Lawrence
- Card 171: Egyptian Desert
- Card 172: British Museum
- Card 173: Rosetta Stone
- Card 180: Napoleon Bonaparte
Mission 9: The Cliffhanger Clue Card Combo[]
Both this combo and Mission 9: The Cliffhanger Clue unlock Mint.
- Card 215: Josephine Baker
- Card 217: Portugal Air Space
- Card 228: City of Spies
- Card 234: Morocco
- Card 241: Scuba Kitty
Other Card Combos[]
The Founding Fathers Card Combo[]
This combo unlocks Honey.
Cahill Collision Card Combo[]
This combo unlocks Hydrogen.
Madrigal Temple Card Combo[]
This combo unlocks Pepper.
The Wild West Card Combo[]
This combo unlocks Wormwood.
The Madrigal Stronghold Card Combo[]
This combo unlocks Barley.
The Ocean Secret Card Combo[]
This combo unlocks Quartz.
The X-Ray Clue Card Combo[]
This combo unlocks Copper.
Buried Secrets Card Combo[]
This combo unlocks Vinegar.
Frankenstein's Secret Card Combo[]
This combo unlocks Iodine.
The Missing Explorer Card Combo[]
This combo unlocks Bone.
- Card 79: David Livingstone
- Card 83: Henry Morton Stanley
- Card 102: The ClueCraft 3000
- Card 126: Victoria Falls
- Card 129: The Tattoos
New York Subway Card Combo[]
This combo unlocks Rosemary.
Turkish Delight Card Combo/ Hagia Sophia Card Combo[]
This combo unlocks Sulfur.
The Desert Mystery Card Combo[]
This combo unlocks Calcium Carbonate.
The Stolen Clue Card Combo[]
This combo unlocks Salt.
- Card 158: The Last Message
- Card 160: Sir Walter Raleigh
- Card 181: Tower of London
- Card 185: The Missing Colony
- Card 196: Raleigh's Map
The Mountain Challenge Card Combo/The Inca Clue Card Combo[]
This combo unlocks Cocoa.
- Card 226: Alistair the Underdog
- Card 231: Ekat Agent Boot
- Card 240: Machu Picchu
- Card 242: Scoreboard Code
The Mad King Card Combo[]
This combo unlocks Pearl.
- Card 84: Neuschwanstein Castle
- Card 87: Spy Pigeon
- Card 103: The Ludwig Conspiracy
- Card 104: Mad King Ludwig
Eiffel's Secret Card Combo[]
This combo unlocks Blood.
The National Palace Card Combo[]
This combo unlocks Platinum.
- Card 154: Emperor Maximilian
- Card 157: Ambrose Bierce
- Card 191: National Palace
- Card 193: Execution Order
Sandstone City Card Combo[]
This combo unlocks Lily.