Electroplankton

Electroplankton (エレクトロプランクトン Erekutoropurankuton) is an interactive music video game developed by indieszero and published by Nintendo for the Nintendo DS handheld video game console. It was first released in Japan in 2005, and was later released in North America and Europe in 2006. This game allows the player to interact with animated plankton and create music through one of ten different plankton themed interfaces. The first-run edition of Electroplankton in Japan came bundled with a set of blue colored ear bud headphones.

The game offers two game modes — Performance and Audience. The Performance mode allows the user to interact with the plankton through use of the stylus, touchscreen, and microphone. Audience mode simply allows the user to put down the system and enjoy a continuous musical show put on by all of the plankton, although the user can interact with the plankton just like in Performance mode. Audience mode is like a demo mode in some other games.