puzzler

noun 0.700

puzzle

noun 0.687

riddle

noun 0.672

brainer

noun 0.652

puzzling

noun 0.631

puzzle box

noun 0.611

riddler

noun 0.591

teaser

noun 0.581

jigsaw puzzle

noun 0.577

conundrum

noun 0.575

enigma

noun 0.573

brain

noun 0.563

mind game

noun 0.558

crossword puzzle

noun 0.558

rebus

noun 0.553

crossword

noun 0.552

brainwork

noun 0.549

thinking machine

noun 0.540

brainpower

noun 0.536

tongue-twister

noun 0.530

brainpan

noun 0.529

braininess

noun 0.524

brainstorm

noun 0.524

no-brainer

noun 0.522

brains trust

noun 0.521

puzzlement

noun 0.521

sudoku

noun 0.520

riddling

noun 0.520

brain scanner

noun 0.519

teaze

noun 0.515

baffle

noun 0.515

tough nut to crack

noun 0.513

jigsaw

noun 0.511

mastermind

noun 0.510

guessing game

noun 0.509

head case

noun 0.508

cryptogram

noun 0.502

mathematical game

noun 0.501

electronic brain

noun 0.500