Fighting Vipers Easter Egg - Sonic

Ok, first you need to hack the game, now all you do is that there should be something about character select. Now change the value by adding 1 to it, so if it is 9, you make it 10, 7-8, and etc. Now play the game. In character select, go to the furthest right, you should select a character that isn't on the board, and guess what, it's Sonic The Hedgehog!