After completing Road to International Cup with the team of your choice, go to edit player of the team you completed with. There will be extra options in 'Hair' and 'Others'.
This is not mentioned in the guide - but if you hold X and charge your shot fully and just before your kicker kicks the ball press X once more and you will get a low powerful shot - you know if it works because your powerbar will go ORANGE ... handy at close range
Play in Road to International Cup mode. When you get to the World Cup tournament in year 4, the stadium is unlocked after you win your first game at the World Cup.
Play in ranking mode and accumulate 20 points. FC Sonic will challenge you. Beat them and they are unlocked and can now be used as a playble team.
After doing the Cap and Glasses Trick, go to the name of the player and type 'CAT'. Go back to 'Face' options and you will see your player in cat face.