Premodifier: challenging
Head noun: puzzle

Same concepts

Broader concepts

labelprovenanceconfidence
somethingisap:4225107160.203229

Narrower concepts

labelprovenanceconfidence
sudokuisap:3915612860.435015
computerisap:4843379880.277865
gameisap:3106872800.236595
errorisap:1645673790.107661