Divide class into two teams, each team has a set number of white foam blocks and 6 colored blocks (hula hoop holders). Main object to the game is to build a structure out of the white blocks that will protect the colored blocks. Once a colored block touches the floor it is out. The way you knock a block out is by throwing a snowball (yarn ball) or a cannon ball (gator skin ball) at the blocks. Game is over when all colored blocks are touching the floor.