Using your Heroes of Goo Jit Zu Marvel Goo Shifter is super easy. For Red Smash Hulk, find the core under his chest and crush it. You'll see an amazing color change in his goo filling. You can also squeeze and stretch him up to three times his size. When you're done stretching, he'll go back to his original shape. Here are some things to keep in mind. Don't pull too hard or you might damage the toy. Also, keep the toy away from sharp objects. To maintain your Goo Shifter, just keep it clean. If it gets dirty, you can use a damp cloth to wipe it. Have fun playing with your collectible heroes and creating new adventures!