Ancient Egypt - A good tutorial world it teaches you the basics of the game the plants are also very good for beginners except the Twin Sunflower i guess but the tombstones are uncalled for.
Pirate Seas - It's like a fun sequel of the original theres not much i can say theres not much revolutionary gimmick to the world, obvious because its the second world the only criticism i have is how long you have to play to get cherry bomb it should be like in the middle of pirate seas.
Wild West - The only thing motivating me to speedrun this world is the abundance of upgrades not much new plants and too many objectives in the later levels
Frostbite Caves - So if you just unlocked Frostbite Caves it may be difficult for you just like how i see it when i just unlocked it also dont rely fully on the Pepper-pult because it have a bad recharge use it when its available. And also the game rewards you with Torchwood if you play the game everyday for a week so use that instead of Pepper-Pult
Lost City - It started to be very difficult for me at first when i replayed it but (i know this sounds like a very bad advice and i can hear gifted human typing on his keyboard rn) USE CHILI BEAN! I know a lot of people trash Chili Bean and i can see that but it is a way better substitute for potato mine and good at killing excavators or Bucketheads. The Gold Leaf sucks mainly because there's only some levels remaining after u unlocked it and its useless in other worlds
Far Future - By far the most relaxing and both motivating level in the whole of Adventure Mode the game gives you the right equipment and plants for every type of zombies. theres only 25 level, very cool new zombies. the gimmick is also SUPER HELPFUL
Dark Ages - Very easy? I dont know how a lot of people think its hard (my cousin have been stuck at one level for 2 weeks) the no sun gimmick is not hard its just plain annoying. just spam puff shroom until u have a very good defense
Neon Mixtape Tour - THE WORST WORLD i like the aesthetic and the zombies but its TOO HARD. Bucketheads are on every corners and not to mention how most of the plants given are very useless in its own world! Phat Beet and Celery Stalker cant function with the Existence of the MC-Zom B and so is the punks. Thyme Warp is good but useless in other worlds. THERE'S NO expensive plants here so intensive carrot is useless with other NMT Plants and Garlic can be easily thrown by the punk zombie
Jurassic Marsh - Probably the most boring world. The plants are useful but lack in creativity. also theres no creative zombie in this world except for the rocksmasher.
Big Wave Beach - Yes its difficult but how you guys act about it is ridiculous and overdramatic the most harder levels are actually in the middle the easiest one is at the start and the end i beat it in one day and a half because i finish the last few levels at lunch the very tomorrow. I would say Big Wave Beach is like a harder Lost City
Modern Day - Modern Day have a medium difficulty not too hard and not too easy. The ending of the game in my opinion sucks also its a very beatable level you can try to beat it in a day or something