User blog comment:Fairy27/Suggestion about the order of unlocking worlds/@comment-25089892-20151226092216

1. AE (duh)

2. PS (same difficulty and useful plants)

3. FF (WW is a little harsh, and its Brain Buster is long and not really enjoyable)

4. DA (not kidding, first ten levels are easy)

5. WW (once you get enough useful plants, you can just fullfill this one)

6. FC or LC (both share the same difficulty so the decision is rather up to you)

7. NMT (with all the great stuff you've got)

8. BWB (not joking, I find JM more hard than BWB)

9. JM (the gimmick of dinos is annoying and I'd recommend you to bring everything you've got on it)

10. MD (it's not out yet, but it's definitely best to be played last because you know what are you playing against)

Of course, I'd recommend unlocking all worlds first by going to Days/Nights 8/10/16 in each world and unlocking next.