there are 2 to choose from, plus another 2 for kids to splash about in. it may release ultra-fine particles that can get into your lungs. i almost had to learn this the hard way. she had one section i had another. all of this was achieved through simple inexpensive means. then all players take turns to select a crop tile from the central board and place it on his personal mat. typically, there are no symptoms right away. he also was 29 years old, and definitely could contribute for years to come – if he decided to stay in st. louis. 