gimmick

nouns

a drawback or difficulty that is not readily evident
"it sounds good but what's the catch?"
catch, gimmick
something unspecified whose name is either forgotten or not known
"she eased the ball-shaped doodad back into its socket"; "there may be some great new gizmo around the corner that you will want to use"
doodad, doohickey, doojigger, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget
any clever maneuver
"he would stoop to any device to win a point"; "it was a great sales gimmick"; "a cheap promotions gimmick for greedy businessmen"
device, gimmick, twist