Battle system

Unlike Pokémon and other monster battle RPGs, the battles in this game are group based. Rather than controlling a single bacteria, you control a group of the pixel-sized creatures in a face-off against a group of equally tiny foes. During a battle, the touch screen shows an overhead view of the entire battlefield, which takes on different shapes depending on the battle at hand. To control your bacteria group, you draw circles around the section that you want to move. Follow this with a straight line, and the bacteria move off in the intended direction. You also can blow into the microphone to scatter groups of bacteria that you've circled in order for them to have enough space to reproduce themselves.

Depending on the type of battle, the goal in battle is to either destroy all of your opponent's bacteria or to have more bacteria than your opponent at the end of the time limit. Killing off all your rivals won't be as easy as it sounds, as the bacteria replicate over time. All the gameplay during battle appears to take place on the bottom screen. Meanwhile, the top screen shows a close-up view of the action, allowing you to get a closer look at the game's creature design. You're free to move a viewing window around the touch screen to get a full view of the action from the top screen.