ENIGMAS

Perplexing people

• Bafflers

• Baffling problems

• Brain teasers

• Contradictory characters

• Conundrums

• Head-scratchers

• Inexplicable occurrences

• Inscrutable people

• Inscrutable types

• Knots

• Knotty problems

• Mysteries

• Obscure riddles

• Paradoxes

• Perplexing puzzles

• Posers

• Puzzlers

• Puzzling posers

• Riddles

• Sphinxes

• They're hard to figure

• They're hard to figure out

• They're puzzling

• Tough nuts to crack

• W.W. II code machines