1. To grow them, you simply put them into a large bowl and cover with 5 cups of water and watch them expand over the next 5 or so hours.
2. PRO-TIP - Use warm/hot tap water for faster growth.
3. Once they have grown, drain away excess water and voila, you have a bowl of slippery, colourful, bouncy, ball fun!
4. To clean after play, rinse with a little hand sanitiser and water, drain and store in an airtight container.