Below are the tips for selected levels.

?? LEVEL 1

Best perk: Sun Break Perk

Score level: high level plants have the advantage over low level plants.

Beware of Gargantuar and Sandstorm which can destroy your plants from the back.

?? LEVEL 2 | PERK GRIND

Best perk: Boost Tile Perk

An easy (but a bit long) level to complete 2/2 Bonus Objectives.

Use Plant Food on Iceberg Lettuce and place Iceberg Lettuce on the Boost Tile.

Use Thyme Warp only during an emergency case - usually only 1-2 is sufficient.

Mecha-Football Zombie can push back the zombie-transformed Puff-shroom / Fume-shroom / Toadstool, shoveling off these plants can prevent the protected plants from being eventually pushed off the lawn.

Jester Zombies can deflect Apple Mortar's and Bowling Bulb's projectile, which in turns can damage the protected plants.

?? LEVEL 3

Best perk: Sun Break Perk

Focus on Pokra + Shrinking Violet + Imp Pear to complete this level.

?? LEVEL 4 | PERK GRIND

Best perk: Sun Break Perk

Recommended plants: Draftodil, Imp Pear - due to ZCorpion.

Draftodil: Stun Zombies, synergize with Raptor to blow off airborne (i.e. kicked) zombies.

Imp Pear: ZCorpion can target at Imp Pear, Imp Pear plant food can transform ZCorpion into Imps.

?? LEVEL 5 | PERK GRIND

Best perk: Sun Break Perk / Bass Blast Perk

Recommended plants: Olive Pit, Teleportato Mine, Explode-o-Vine.

Chomper is somewhat useful as an instant kill plant, it is okay to keep them on the lawn.

Explosive plants are useful to one-hit kill multiple zombies in general.

Spear-mint can create Spikerock to one-hit kill Pianist Zombie and handle Hamster Brawl.

Beware of All-Star Zombies and Newspaper Zombies - they can get through the flower line very easily if not handled properly.

?? ZOMBOSS | Zombot Aerostatic Gondola - Lost City (with ZCorpion)

Zombie level: Lvl 1 / 4 / 7

Zomboss health bar: 3 / 5 / 7

Seed slot: 7 / 6 / 5

Locked plant: Bramble Bush

Best perk: Sun Break Perk

Recommended to bring Blover or Draftodil to blow off airborne zombies.

Not recommended to bring zombies with knockback effect - zombies can possibly activate the flame tile.

Bramble Bush can actively trap any zombies released from ZCorpion's vase.

Sun production is optional.

Especially thanks for Youtube UP : Darren-G