BOSTON (AP) — A new daily fantasy sports game that lets users hone in on a single NFL playoff game has some gambling experts wondering if the contest inches the industry closer to the territory of sports betting that remains illegal in most of the United States.

The "Showdown" variant offered by leading fantasy sports company DraftKings allows users to pick six athletes from two teams playing against each other in a real-life football game, racking up fantasy points based on stats like touchdowns, receptions and yards passing, rushing or receiving. That means users playing "Showdown" this week...