Using these Heroes of Goo Jit Zu figures is easy and fun. You can simply squish and stretch them up to three times their size. When you're done, just let go and they'll bounce back to their original shape. To use the 'Chomp Attack' feature, just play around with the figures in an action - packed battle. Remember, these figures have small sea creatures hidden inside the goo. When squeezing them, be gentle to discover these little surprises. As for maintenance, keep them away from sharp objects that could puncture the goo. If they get dirty, you can use a damp cloth to wipe them clean. Also, store them in a cool and dry place to keep them in good condition.