This is my strategy for Pyramid of Doom after level 10. It uses Melon-pults and Winter Melons. No need for premium plants, just use money and to buy Plant Food and power-ups if needed.
Plants needed for every level[]
- Twin Sunflower
- Potato Mine
- Iceberg Lettuce
- Winter Melon
- Melon-pult
- Cherry Bomb
- Grave Buster
- Spikerock (if there are Gargantuars)
Strategy[]
Plant a Twin Sunflower and give it plant food. Use Grave Buster to remove graves at the second and third columns. Plant a Potato Mine at the 3rd column when the first zombie comes. If there are two zombies, use Potato Mine and Chili Bean. If you have enough sun, start planting Winter Melons in the third column. Continue planting Twin Sunflowers at the back two columns. Before the first flag, you must have two Twin Sunflowers and one Winter Melon in each lane. After the first flag, start planting Melon-pults in the 4th and 5th columns. By the end of every level, you must have at least one plant food. If not, use money to buy plant food, or pick a sun or plant food card if there is.
Set-up:
| Ts | Ts | Wm | Mp | Mp | ||||
| Ts | Ts | Wm | Mp | Mp | ||||
| Ts | Ts | Wm | Mp | Mp | ||||
| Ts | Ts | Wm | Mp | Mp | ||||
| Ts | Ts | Wm | Mp | Mp |
Ts - Twin Sunflower
Wm - Winter Melon
Mp - Melon-pult
Sr - Spikerock
On levels with 3-4 flags, you may add more melons in the 6th and 7th columns, but this is optional.
| Wm | Ts | Ts | Mp | Mp | Mp | Mp | ||
| Wm | Ts | Ts | Mp | Mp | Mp | Mp | ||
| Wm | Ts | Ts | Mp | Mp | Mp | Mp | ||
| Wm | Ts | Ts | Mp | Mp | Mp | Mp | ||
| Wm | Ts | Ts | Mp | Mp | Mp | Mp |
Gargantuars[]
Some levels have Gargantuars. Use the same strategy as above but add more melons. One column of Twin Sunflowers is enough because one normal sun is now worth 50 sun in the update which is two normal suns in the original game. You may still use two columns of Twin Sunflowers if you want to get sun faster, but replace them with melons later. Spikerocks in the third column kill Imps. You may use power-ups or plant food if needed. If Gargantuars appear early in the level, freeze them with Iceberg Lettuce until you get enough melons.
Set-up:
| Wm | Ts | Sr | Mp | Mp | Mp | |||
| Wm | Ts | Sr | Mp | Mp | Mp | |||
| Wm | Ts | Sr | Mp | Mp | Mp | |||
| Wm | Ts | Sr | Mp | Mp | Mp | |||
| Wm | Ts | Sr | Mp | Mp | Mp |