Sonic Ultra - The Return
 
 Cheat:
 At the Sound Test screen, type 'cheater'. 
 A button should appear. Click it to go to Level Select.
 
 To play the final bosses, choose Enter a Password from 
 the Game menu. 
 Type fb1, fb2 or fb3 for final boss 1, 2 or 3 respectively. 
 Click OK. Make sure that you're in a level when you do this, 
 otherwise you could end up playing as both characters at the 
 same time.