In two player mode, pause the game and type "7KIDS". The border should flash. Quit the current game and restart a two player game. You both can have the same fighter. For inviciblity, start a one player game and place the cursor over blanka but don't hit fire. Type "PATIENCE" in slowly and the border will flash yellow. Now select your fighter as normal and press 'F10' at any time to top off your energy.