Gloom Farming

This is a money farming strategy designed to win the minigame by Snowttail. It has a middling success rate on the DS due to Football Zombies.

Plants
Fume-shroom

Gloom-shroom

Coffee Bean

Garlic

Pumpkin

Lily Pad

Marigold

Magnet-shroom(optional)

Gold Magnet(optional)

Imitater Garlic/Pumpkin(optional)

Planting the plants
This is a symmetrical build, so I will not mention the 4th, 5th or 6th lanes.

First Flag
In the second lane in where your defences will be. Plant a Garlic in the column closest to the zombies and then plant 6 Gloom-shrooms behind that. Wake them up. Now for the Marigolds. Plant a 2x2 square of Marigolds in lanes 1 and 2, at the back. Then plant a Marigold in lane 3, column 2. Now for the Pumpkins. Plant one on the Gloom-shroom next to the Garlic, and one on the front Marigolds in lanes 1 and 3. Start the onslaught and be ready to collect.

Onwards
Plant a Gold Magnet in lane 3, behind the Marigold when you have enough sun to deal with everything.

Replacing
Yes, you need to replace Pumpkins and Garlics occasionally. If you don't have an Imitater of a plant, and both of those plants are at their final stage, replace one. If only one is at its final stage, wait until it gets eaten to replace it.

Money
This strategy will get you about $3,000 not including the Trophy/Coin Bag.