gimmick
noun
°A trick or device used to reach some end.
"The box had a gimmick to make the coin appear to vanish."
°A clever ploy or strategy.
"The contest was a gimmick to get people to sign up for their mailing list."
verb
°To rig or set up with a trick or device.
"The magician's box was gimmicked with a wire that made it appear to open on its own."