Puzzle is an unreleased game for the North American NES market, evidenced by the '(Unl)' designation. Its beta status suggests it was in development but never fully launched officially.  Limited information prevents us from knowing its gameplay features, developer, or specific reasons for its cancellation.  Further research into unreleased NES games may reveal more information.

Puzzle (USA) (Unl)

Puyo Puyo (Japan)