Heavy Bag Hero is a game where players use their boxing bag to fight bosses. Before starting, the player calibrates by punching the bag — the game uses microphone input to detect impacts, connecting real-world hits to in-game actions.
Each boss is a unique character that changes between sessions, motivating the player to keep training and discover the next one.
The game draws inspiration from Street Fighter, including its sound design. A key challenge was ensuring the game's audio didn't interfere with the microphone detecting the player's punches on the bag.
The player wins by maintaining their punching pace throughout the round. If the pace drops too much, the boss takes over and wins.