User blog:Fairy27/Suggestion about the order of unlocking worlds

Hey, whether you know it or not, I'm new in PvZ2. I've beaten Ancient Egypt Day 8, and got a world key (and a bonus world key for some reason). Pirate Seas would be the 2nd world I'll go, then Wild West as the 3rd one, but after with that, the next worlds would be very challenging.

So, what would be the recommended order for unlocking worlds?