User blog comment:Cinnabar The Evil Gem Chemist 55555555555555555550/Just beat level 410... Now entering SODA SWAMP!!!/@comment-27028390-20131018200733/@comment-16894369-20131027040533

From what I hear, 419 and 421 are both pretty hard. I wasn't stuck on 419, but I ended up spending a lot of time on 421.