In the battle Cakenstein Attacks! (Level 13+) you have to simply defeat Cakenstein, but it is not so simple while fighting him he will run around the area eating the cakes and getting stronger while doing it. He seems to have a weakness of the Fire Power-Up by saying "Fiiire!! baaad!!" It is possible to become one after eating a cake that you can get during the Birthday Bash, entitled the "Boss Cake."