Board Thread:Plants vs. Zombies 2: It's About Time/@comment-5052376-20140621075532/@comment-24243917-20140623111042

Milesprower2 wrote: I find 5-9 to be the only level in Adventure Mode that's both challenging and fun. mmmm....

I believe that fun levels are 5-4 and 1-10, 2-10 and 3-10 (possibly 4-10 too)

Challenging?

Only 5-9, and it isn't pretty fun (Well, it is)