Who played the most hours of Works of Widenius?
SELECT stuID FROM Plays_games AS T1 JOIN Video_games AS T2 ON T1.gameid   =   T2.gameid where t2.GName  =  "Works of Widenius" order by hours_played desc limit 1
most hours of Works of Widenius refers to MAX(hours_played) for 'Works of Widenius'; who played refers to SELECT stuID;