-Click on one of the seeds on either side of the screen to select it. -Click on the lawn to place whatever you have selected. -Click the plants and zombies to delete them. -Click the pause button to pause the plants and zombies (you can still place while paused) -Click "clear" to delete everything on the lawn. -Right now, only day plants and zombies are present. -You can just play around with the plants and zombies. -You can also set up some plants and then try to penetrate the defense by placing zombies. That's fun (:
