| Aka: | Heavyweight Champ |
| Console: | Sega Master System |
| TV Standard: | NTSC-U |
| Country: | United States of America |
| Developer(s): | Sanritsu, SIMS Co., Ltd. |
| Publisher(s): | Sega of America, Inc. |
| Release Date: | 1990-12-01 |
| Players: | 2 |
| Co-op: | Yes |
| ESRB: | E - Everyone |
| Type: | Fighting, Sports |
The game is essentially a side scrolling boxing game where the player moves left and right to control a screen sized boxer. When the timing is right, the player can unleash a final blow punch which can sometimes KO the opponent in a single strike. The home versions contained a spectator mode where the player can watch their favorite boxers compete.
Game Player of James 'Buster' Douglas Knockout Boxing on Sega Master SystemGenerally, you can review the controls (keyboard) setting during each game in the screen before it starts. Use the arrow keys and “Z”, “X”, “A”, “S”, “Q”, “E” buttons to play, or customize yourself with your gamepad or keyboard.
| Keyboard | Controls |
| ← → ↑ ↓ | Directions for LEFT, RIGHT, UP, DOWN |
| Enter ↵ | START |
| Shift | SELECT |
| Z | A |
| X | B |
| A | X |
| S | Y |
| Q | L |
| E | R |
