grabber Synonyms

braintwister subtlety stumper stickler sphinx snatcher seizer secret secrecy rune roun riddle rebus question puzzlement teaser twister usurper mindboggler tough nut to crack picker-upper cincher chiller brainteaser pinchgut koan grappler digitiser thriller puzzler capturer why puzzle problem fascination enigma dilemma difficulty cryptogram crux clincher clasper charade challenge case argument apprehender annexationist grasper griper