Please list the names of the publishers of all the puzzle games.
name of publisher refers to publisher_name; puzzle refers to genre_name = 'Puzzle'
SELECT DISTINCT T3.publisher_name FROM game AS T1 INNER JOIN game_publisher AS T2 ON T1.id = T2.game_id INNER JOIN publisher AS T3 ON T2.publisher_id = T3.id INNER JOIN genre AS T4 ON T1.genre_id = T4.id WHERE T4.genre_name = 'Puzzle'