Survival: Night (Hard) - Melons, Magnets, and Gloom-shrooms

This uses Melon-pults and Winter Melons because they do heavy damage to groups of zombies and freeze them which is useful here. There are also Magnet-shrooms to steal metal objects from zombies. The Gloom-shrooms can do heavy damage fast to nearby zombies.

1st round
Start with two columns of sunflowers at the back and Puff-shrooms at columns 4 to 6. If you have enough sun, plant Snow Peas at column 3, replace Puff-shrooms with Fume-shrooms at the 4th and 5th columns, and upgrade the Sunflowers at the back to Twin Sunflowers. When there are Buckethead Zombies, plant Magnet-shrooms in pumpkins at column 6. Remember to use Grave Busters to remove the graves.

S - Sunflower

Ts - Twin Sunflower

Ps - Puff-shroom

Sn - Snow Pea

Gs - Gloom-shroom

Mp - Melon-pult

Wm - Winter Melon

Ms - Magnet-shroom

- Pumpkin

2nd round
Plant Melon-pults at column 3 and 4 and upgrade those at column 3 to Winter Melon. Upgrade all the Sunflowers to Twin Sunflowers. Plant Gloom-shrooms in pumpkin at column 7.

3rd round
Replace Fume-shrooms in column 5 with Melon-pults. If there are Diggers, replace sunflowers at column 2, rows 2&4 with Gloom-shrooms and pumpkin the back in case Diggers get past the magnets.

4th round
Plant Spikerocks in front of Gloom-shrooms for the vehicle zombies. Leave the rightmost column blank.

5th round
If there are Gargantuars, replace magnets with melons and pumpkin the 3rd column for Imps.