A billion planets, numbered 0 to 999999999, await your discovery. On each planet you will encounter a mysterious creature. You will be given one creature to start your collection, but after that you will have to defeat the local champion with one of your own best fighters.

You will not be able to witness creature battles, but you can read a blow-by-blow description of what happened. If you champion has failed, you will be able to analyze its weaknesses and choose a better fighter for the next attempt.

As you work your way through the galaxy, you can keep your favorites and release the rest, because your collection can only contain one hundred. With an almost endless variety to choose from, your collection will be unique to the known universe!