Hey You, Pikachu! is a virtual pet Pokémon spin-off video game. The player is asked to help Professor Oak test the PokéHelper, a device that lets humans communicate with Pokémon. Introduced to a wild Pikachu, the player is able to communicate with a 256-word database through the Voice Recognition Unit (VRU), a Nintendo 64 hardware accessory that, when paired with a microphone, can comprehend and analyze human speech. Along with speaking with Pikachu, the VRU allows the player to move around and gather items.