In the game you play as the ChuChus, a species of terrified space mice that need to escape to their rockets from the hungry KapuKapus, a species of giant alien cats.

Players compete to get the most amount of ChuChus into their rocket (indicated by the color) by placing up to four arrows on a board. Clever placement will allow you to take ChuChu from your opponents.

Points are awarded depending on the color of the ChuChu:

• Blue and white ChuChu are worth one point and are by far the most common ChuChus in the game.
• Golden ChuChu are worth 50 points
• Pink and red ChuChu are unique in that they activate a bonus when obtained:
  • Speed Up! makes both the ChuChu and KapuKapu move far more quickly
  • Slow Down which makes both the ChuChu and KapuKapu slow down.
  • Mouse Mania! which removes the KapuKapus and large numbers of ChuChus appear.
  • Cat Mania! which removes the ChuChus and lets the KapuKapu charge around the screen trying to enter the rockets and devour the mice within.
  • Mouse Monopoly! which makes ChuChus get sucked into the rocket without the need to navigate the map.
  • Cat Attack! which summons a KapuKapu to each opponents rocket.
  • Place ↑ Again: which removes all arrows and allows everyone to place their arrows down in new locations.
  • Everybody Move! which swaps everyone's rockets around randomly, meaning arrows that benefitted you may now be helping your opponent.

KapuKapu's reaching the rocket will devour a third of all stored ChuChus within it.

The Gameboy Advance port would allow players to connect to one another and compete via link cables.