Show all video game types.
SELECT DISTINCT gtype FROM Video_games
SELECT DISTINCT gtype FROM Video_games
[{'GType': 'Collectible card game'}, {'GType': 'Walking Simulator'}, {'GType': 'Role-playing game'}, {'GType': 'Grand strategy'}, {'GType': 'Frist-person shooter'}, {'GType': 'Massively multiplayer online game'}]