The Paint gun is an item new to Kingdom Hearts 3D: Dream Drop Distance, It's used to paint a part of a spirits body. Each spirit has it's on ONE part of the body that can be turn one of the eight colors that can be obtained in a treasure box or bought at any store. To color the spirit you go into the Spirit menu and on the touch screen select the paint gun icon. You then can select the color you wish to paint the spirit, Be sure you have 15 of this color. Then line the circle up with the spirit and shoot! It will take 15 shots intill the body part that changes color on that spirit turns the exact color of the paint you were using. It's ideal to save before you do this so if you dislike the results you can just turn off the game.