User blog:ProcastinatorMan/The blog in which ProcastinatorMan proposes a challenge for each minigame.

Zombotany: Finish without defensive plants or plants too low for peas to hit them.

Wall-nut Bowling: Gain at least $200 from killing zombies

Slot Machine: Get a diamond from the Slot Machine

It's Raining Seeds: Obtain at least 3 Marigolds

Beghouled: Finish with less than 10 invalid moves( move a plant in any direction but said direction won't make a match of 3+)

Invisighoul: Beat any of the level's Zombonis without using Squash

Seeing Stars: Finish and fill the star spaces ONLY with Imitater Starfruit

Zombiquarium: Finish under 2 minutes(real time)

Beghouled Twist: Finish with less than 15 invalid moves.

Big Trouble Little Zombie: Finish without using Cherry Bomb

Portal Combat: Finish without Wall-nuts

Column Like You See 'Em: Complete without pumpkins and planting less than 4 Flower Pots

Bobsled Bonanza: Finish without melting the ice trails or using instants to kill the Zombonis

Zombie Nimble Zombie Quick: Finish without Peashooting plants, Tall-nuts, or slowing plants.

Whack-a-Zombie: Whack the hammer to the music rhythm AND complete the minigame

Last Stand: Formulate a strategy that survives between 2 and 3 waves without using the Shovel.

Zombotany 2: Defeat 2 Tall-nut Zombies without using Instants

Wall-nut Bowling 2: Finish without losing any lawnmower.

Pogo Party: Finish without Squash

Dr. Zomboss's Revenge: Don't destroy any fireball or iceball.

Buttered Popcorn(iPad only): Finish with only 1 Cob Cannon left

Air Raid(DS only): Finish receiving less than 5 hits.

Homerun Derby: Destroy 10 zombies by swinging baseballs at them

BOMB All Together!: Finish with at least 1 explosive left.

Zombie Trap: Finish it with at least 4 cages left.

I wish you luck.