I decided to use elements as my theme throughout the difficulty settings:
Easy: hydrogen, oxygen, nitrogen, calcium, iron
Medium: bromine, silicon, magnesium, argon, titanium
Hard: rubidium, galium, antimony, iodine, krypton
I decided to use elements as my theme throughout the difficulty settings:
Easy: hydrogen, oxygen, nitrogen, calcium, iron
Medium: bromine, silicon, magnesium, argon, titanium
Hard: rubidium, galium, antimony, iodine, krypton