Conveyor-belt levels

Conveyor-Belt Levels are levels where all the seeds you recieve come on a Conveyor Belt, with no cost in Sun.

For this reason, you never recieve Sunflowers or Sun-shrooms on these levels. Also, you never recieve Upgrade Plants, probably because you can't get rid of them without their base Plants.

Levels Out of all the levels of Adventure, the final levels (e.g. 1-10, 2-10, etc.) are Conveyor-Belt Levels. So are 1-5 and 5-5.

Also, the Mini-games are Conveyor-Belt Levels.
 * Wall-nut Bowling
 * Invisighoul
 * Big Trouble Little Zombie
 * Portal Combat
 * Column Like You See 'Em
 * Wall-nut Bowling 2
 * Dr. Zomboss's Revenge

It's Raining Seeds and Slot Machine are not Conveyor-Belt Levels.

Strategy Your strategy should be different, depending on the level, but remember to save up One-Use Explosives (Jalapeno, Doom-shroom, etc.), Hypno-shrooms and Ice-shrooms.

Also, remember to plant at the back of the Lawn if you have enough range, as you need no room for Sunflowers/Sun-Shrooms/Twin Sunflowers.

Trivia
Garlic, Umbrella Leaf, and Marigolds never come on Conveyor-Belt Levels (although they can Rain down from the sky.)