What is the genre of the game '2 Games in 1: Sonic Advance & ChuChu Rocket!'?
genre refers to genre_name; '2 Games in 1: Sonic Advance & ChuChu Rocket!' is a game name;
SELECT T2.genre_name FROM game AS T1 INNER JOIN genre AS T2 ON T1.genre_id = T2.id WHERE T1.game_name = '2 Games in 1: Sonic Advance & ChuChu Rocket!'