Who's the hardest boss in Super Mario Galaxy? Bouldergiest 38.14 % (788) Bowser (third time) 27.73 % (573) None 13.99 % (289) Major Burrows 6.53 % (135) Kingfin 6.49 % (134) Kamella (second time) 5.13 % (106) Baron Brrr 1.98 % (41) Total votes: 2066