Every clue has a card combo and every card combo has a Clue Key. Here are the clue keys (in order by clue) Clue 1: Honey - N/A Clue 2: Hydrogen - N/A Clue 3: Silver - Eye of Horus Clue 4: Pepper - The Angkor Vat, atemple in Angkor, Cambodia Clue 5: Mercury - Lightning bolt Clue 6: Wormwood - Spur Clue 7: Barley - Butterfly Clue 8: Quartz - Fish Clue 9 : King Cobra Venom - N/A Clue 10: Magnesium - Snowflake Clue 11: Uranium - N/A Clue 12: Water - Drop of water Clue 13: Phosphorus - Loch Ness monster Clue 14: Copper - Crossed Bones Clue 15: Vinegar - M Clue 16: Gold - N/A Clue 17: Iodine - Open book