This game has a prototype article
The only beat-em-up developed by Toaplan, and one of their last games released before their dissolution in 1994. What a Knuckle Bash it was!!!
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.
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.