When was the game titled 3DS Classic Collection released?
when refers to release_year; the game titled 3DS Classic Collection refers to game_name = '3DS Classic Collection'
SELECT T1.release_year FROM game_platform AS T1 INNER JOIN game_publisher AS T2 ON T1.game_publisher_id = T2.id INNER JOIN game AS T3 ON T2.game_id = T3.id WHERE T3.game_name = '3DS Classic Collection'