If the invulnerability dipswitch is turned on, a level select can be accessed during gameplay by pressing 1P Buttons 1 + 3. Button 3 is not used by the game otherwise, though it is present in the input test in the service menu and does function there.
This needs some investigation. Discuss ideas and findings on the talk page. Specifically:
Any other regional differences?
Japan
US/Europe
The Japan version title logo has different animation: the letters in BASH slide in from right to left, and the fist in the logo punches in and cracks the B.
