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Play K.O. - The Pro Boxing (Japan edition · Japanese) Online
K.O. - The Pro Boxing
Play K.O. - The Pro Boxing online on Game Boy Color. Enter the ring for a boxing contest in K.O.: The Pro Boxing. Read an opponent's movement, work into useful range and balance short attacks with a chance to defend before the next exchange.
Browser play

Game Boy Color (GBC) — EmulatorJS controls
Default Player 1 keyboard mapping. Change keys in Controller Settings.
| Console button | Keyboard |
|---|---|
| ↑ / ↓ / ← / → | ↑ / ↓ / ← / → |
| A / B | Z / X |
| START / SELECT | Enter / V |
Open Controller Settings to configure your keyboard or gamepad. Touch controls are available on mobile.
How to Play K.O. - The Pro Boxing
Quick start
Choose a boxer and an opening bout, read the boxing guide and practise movement plus one short attack before extending a combination.
Controls
D-pad controls movement and selection. Follow the displayed A/B boxing guide for punches and defensive actions; menu A confirms and B returns where offered. Learn guard timing before repeated combinations.
K.O. - The Pro Boxing — About this game
Use the opening bout to learn distance rather than throwing punches constantly. Try a brief attack, see the opponent's response and move back to a position you can control. Recognising the moment after a missed attack helps you decide when to answer and when to stay guarded.
Cheats
No cheats have been added for this edition.
Player verification and sources
Browser play was reviewed before this edition was published in the catalogue. The date below is the catalogue publication date, not the game’s original release date.
- Browser test and catalogue publication date
- Browsers and devices
- PC: Chrome, Edge and Firefox. Mobile: Chrome on Android and Safari on iPhone and iPad.
- Player engine and core
- EmulatorJS 4.3.0-pre · gb
- Tested by
- rwEmulator
Sources and editorial basis
rwEmulator reviews edition metadata, release information, game manuals and first-hand browser-play notes. Available manuals are linked below; the editorial policy explains how facts are checked and corrections are handled.