Cave Story lets you play as one of nine different characters from the game. Simply grab the pbm file from Efraim's site, rename it to "MyChar.pbm", and drop it in the /data directory under the Cave Story folder. When you start the game all main character sprites will be magically switched. Currently you can play as Curly, Toroko, Jenka, Sue, King, Crown, Booster, or a dog. It doesn't change the game much, but you'll have something new to stare at as you discover another excuse to play through the game ... again.