Below are the tips of the selected levels.

LEVEL 1 | PERK GRIND

Use Gold Leaf or Gold Bloom (money premium) to produce suns.

LEVEL 2 | Mini-boss (Cardio Zombie)

Pea strategy (with Appease-mint for low-level plants) can carry this level.

LEVEL 3 | Arena

Impossible to reach even 1M score with all Lvl 1 plants.

LEVEL 4 | Last Stand

Best perk: Sun Bank Perk

Use Bowling Bulb + an explosive plants that can be planted on Lily Pad - Explode-o-Nut.

LEVEL 5 | Conveyor

ZOMBOSS | Zombot Dark Dragon - Dark Ages (with ZCorpion + ZCorp Consultant, Extra Hot)

Zombie level: Lvl 1 / 4 / 7

Zomboss health bar: 4 / 6 / 8

Seed slot: 7 / 6 / 5

Locked plant: Spore-shroom

Best perk: Bass Blast Perk

Blover can blow away all Imps fired through the cannon.

Spore-shroom is not helpful in Zomboss fight, World Plant strategy can be unstable this time around.