Voice input has been used interactively in games for a long time. Existing voice games showed the potential of voice input games by utilizing various features of voice such as voice volume detection, pitch and rhythm detection, speech recognition, and conversation. However, most of these conventional voice games showed that the main game characteristics depended only on the voice input. In this context, we propose Harmonionz, a two-player collaborative game that goes beyond the limits of the existing voice input game genre. Our game has a novelty in which the voice plays a functional and story-wise core role, but the fun of the game is not limited to the voice. In our game, players can win the game when they explore a colorful map, avoid enemies, and eventually create a pitch required by the target with their voice. Each player has a different role. One defeats the approaching enemies and the other creates the pitch. The target pitch is mapped to the color to indicate players the color of the notes that they need to make. Players must find the required pitch by looking at the color on the target. The fun part of conventional voice input games was the voice itself only. However, voice input in our game can easily interact with overall game design including shooting and team-work. The worldview of our game, colorizing the pitch in order to interact with the colorful map, interacting with the background music are our attempts to make our game contextually and logically persuasive.