ENIGMA

It's hard to figure out

• ___ Variations: Elgar opus

• Hmm? inducer

• Hmm provoker

• Hmmmmmm provokeer

• I'm a walking, talking ___: Larry David

• Return to Innocence artist

• Return to Innocence one-man band

• 1982 Martin Sheen film

• Appropriately named monthly of the National Puzzlers' League, with The

• Axis enciphering machine

• Baffler

• Baffling problem

• Brain twister

• Brainteaser

• Bumfuzzlement producer

• Challenging riddle

• Churchill said one enclosed a mystery

• Closed book

• Complete baffler

• Conundrum

• Cracked object of WWII

• Cryptic mystery

• Elgar's ___ Variations

• Encryption machine of yore

• Gamine playing with puzzle (6)

• German cipher machine

• Head-scratcher

• Inscrutable person

• Inscrutable sort

• It's a puzzlement

• It's hard to fathom

• It's hard to understand

• It's inexplicable

• It's mind-boggling

• It's no no-brainer

• It's not clear

• It's puzzling

• It's something of a mystery

• Knot

• Mind-boggler

• Mona Lisa's smile, for one

• Mystery

• National Puzzlers' League publication, with The

• Perplexer

• Perplexity

• Poser

• Problem

• Puzzle

• Puzzle or code

• Puzzle or riddle

• Puzzlement

• Puzzling person

• Puzzling situation

• Puzzling sort

• Puzzling state

• Puzzling thing

• Real poser

• Riddle

• Riddle or puzzle

• Riddle relative

• Something hard to grasp

• Something inexplicable

• Something inscrutable

• Something of a mystery

• Something puzzling

• Sphinx

• Stumper

• They had a hit with Return to Innocence

• Tough nut to crack

• Tough one to figure out

• Tough puzzle

• Toughie

• World War II encoding machine

• WWII cipher machine

• WWII code machine

• WWII coding machine

• WWII encryption machine

• Something that baffles understanding and cannot be explained

• A difficult problem