CREATE TABLE Video_games (gameid VARCHAR)
CREATE TABLE Plays_games (gameid VARCHAR)

Show the game name that has most number of hours played.
SELECT gname FROM Plays_games AS T1 JOIN Video_games AS T2 ON T1.gameid = T2.gameid GROUP BY T1.gameid ORDER BY SUM(hours_played) DESC LIMIT 1
SELECT "gname" FROM "Plays_games" AS "T1" JOIN "Video_games" AS "T2" ON "T1"."gameid" = "T2"."gameid" GROUP BY "T1"."gameid" ORDER BY SUM("hours_played") DESC NULLS LAST LIMIT 1