The mechanic of this level is simple, survive the zombie attack with only ten plants given. Plants are given one at a time meaning, the player will only be given one plant for every zombie that will appear on the lawn.
First, it is easy if one understands its tutorial or it becomes hard: This level is just like a puzzle. A plant will be given in the conveyor-belt. Once the player plants that plant, the conveyor-belt will disappear and he or she needs to kill all the zombies to plant another plant. This is a wave. There are ten waves in total. There will be always a lot of minecart tracks. The player take advantage of them as he or she can only plant one plant each wave. However, planted plants will be saved if he or she survives. The player will not get any lawn mowers, and the player will get Plant Food at the end of this level, so he or she need to make a certain strategy. Keep moving minecart tracks and one will never lose, unless he or she did something wrong.
The small number next to the zombie icon means that zombie will always appear in that lane, with 1 being the topmost lane and 5 being the bottommost one.