I initially planned to make 24 levels, but my imaginative powers ran out after 15th level. Also when playtesting 15th and bonus levels were the only ones i wasn't able to complite tho i was litirally milimetres away from cake in both of them. 18th level is my least favorite because it's not smart-hard, it's dum-hard, but after compliting it, it would say to press B in level selection screen to access bonus level.