Instructions
Press the "Square" button to jump onto the snails and flatten them. Press the "X" button to increase your speed while you move from snail to snail.
Start from the bottom row and work your way to the top, moving from right to left. This is the easiest path to take and can help you complete the task in the allotted time.
Abandon the remaining snails and return to the beginning if the first snail has popped back up before you have completed the task. It is easier to start over fresh each time than to finish and try to loop back around to get the snails that have popped back up.
Repeat this process until you manage to flatten each snail before the first snail pops back up.