puzzle
Anything that is difficult to understand or make sense of.
A game for one or more people that is more or less difficult to work out or complete.
A crossword puzzle.
A jigsaw puzzle.
A riddle.
(archaic) Something made with marvellous skill; something of ingenious construction.
The state of being puzzled; perplexity.
To perplex, confuse, or mystify; to cause (someone) to be faced with a mystery, without answers or an explanation.
To think long and carefully in bewilderment.
To make intricate or difficult to resolve; to entangle.