Card Combos

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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

One False Note Card Combo

Card 17: E-mail Code

Card 18: Amy Cahill

Card 19: Monument Valley

Card 20: Racco Mansion

Card 21: Lan Nguyen

Card 22: Rocketboard

The Sword Thief Card Combo

Beyond the Grave Card Combo

The Black Circle Card Combo

In Too Deep Card Combo

The Viper's Nest Card Combo

The Emperor's Code Card Combo

Storm Warning Card Combo

Into the Gauntlet Card Combo

Vespers Rising Card Combo

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.

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.

Mission 4: The Lucian Fort Card Combo

Both this combo and Mission 4 unlock Clover.

Mission 5: The General's Clue Card Combo

Both this combo and Mission 5 unlock Lead.

Mission 6: The Mad Scientist's Clue Card Combo

Both this combo and Mission 6 unlock Mercury.

Mission 7: The Frozen Secret Card Combo

Both this combo and Mission 7 unlock Magnesium.

Mission 8: The Desert Sabotage Card Combo

Both this combo and Mission 8 unlock Silver.

Mission 9: The Cliffhanger Clue Card Combo

Both this combo and Mission 9: The Cliffhanger Clue unlock Mint.

Other Card Combos

The Founding Fathers Card Combo

This combo unlocks Honey.

Cahill Collision Card Combo

This combo unlocks Hydrogen.

Card 28: CERN

Madrigal Temple Card Combo

This combo unlocks Pepper.

Card 206: Angkor

The Wild West Card Combo

This combo unlocks Wormwood.

The Madrigal Stronghold Card Combo

This combo unlocks Barley.

Card 252: Easter Island Stronghold

The Ocean Secret Card Combo

This combo unlocks Quartz.

The X-Ray Clue Card Combo

This combo unlocks Copper.

Card 60: X-Ray

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.

New York Subway Card Combo

This combo unlocks Rosemary.

Card 67: NY Subway

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.

The Mountain Challenge Card Combo/The Inca Clue Card Combo

This combo unlocks Cocoa.

The Mad King Card Combo

This combo unlocks Pearl.

Eiffel's Secret Card Combo

This combo unlocks Blood.

The National Palace Card Combo

This combo unlocks Platinum.

Sandstone City Card Combo

This combo unlocks Lily.

Card 141: The Sandstone City

v • d • e The 39 Clues
The Clue Hunt	The Maze of Bones • One False Note • The Sword Thief • Beyond the Grave • The Black Circle • In Too Deep • The Viper's Nest • The Emperor's Code • Storm Warning • Into the Gauntlet • Vespers Rising
Cahills vs. Vespers	The Medusa Plot • A King's Ransom • The Dead of Night • Shatterproof • Trust No One • Day Of Doom
Unstoppable	Nowhere to Run • Breakaway • Countdown • Flashpoint
Doublecross	Mission Titanic • Mission Hindenburg • Mission Hurricane • Mission Atomic
Superspecial	Outbreak
Cahill Files Books	Operation Trinity • The Submarine Job • The Redcoat Chase • The Houdini Escape • Silent Night • Spymasters
Additional Books	The Black Book of Buried Secrets • Agent Handbook • Rapid Fire • Midnight Ride • Worlds Collide
Major Characters	Amy Cahill • Dan Cahill • The Outcast • Cara Pierce • Ian Kabra • Nellie Gomez • Jonah Wizard • Hamilton Holt • Sammy Mourad • Nellie Gomez • Aleksander Spasky • Historical Cahills
Authors	Rick Riordan • Gordon Korman • Peter Lerangis • Jude Watson • Patrick Carman • Linda Sue Park • Margaret Peterson Haddix • Roland Smith • David Baldacci • Jeff Hirsch • Natalie Standiford • C. Alexander London • Jenny Goebel • Sarwat Chadda • Clifford Riley • Mallory Kass
Other	Clues • Cards • Missions • Games • Policy

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