Show the number of games which were released on X360 in 2010.
on X360 refers to platform_name = 'X360'; in 2010 refers to release_year = '2010'
SELECT COUNT(DISTINCT T3.game_id) FROM platform AS T1 INNER JOIN game_platform AS T2 ON T1.id = T2.platform_id INNER JOIN game_publisher AS T3 ON T2.game_publisher_id = T3.id WHERE T1.platform_name = 'X360' AND T2.release_year = 2010