There are a number of codes for this game to help you level up and get unique items. Although the game is easy, these codes gave me a massive jump in levels with many free XPs, which helped me take on stronger enemies quicker. This guide has all the Roblox Rock Fruit codes, how you...
The best way to get free rewards in One Punch KO is to join the developer's Roblox group. That way, you'll get a legendary pet (I got a Lion). The other way is straightforward: play the game, and every once in a while, you'll get free Arm Strength, Wins, Leg Strength, Rebirth...