Various creatures have one big love. They do like playing basketball so they challenge you to paly. If you are successful, you will get rid of them for all.
The principle? Very simple. Just score and so harm the opponents. Every creature has different methods how gain bonus throws. Because if you use all the tries you “lose”. Scoring is one hell job, you are going to need a lot of practice before vanishing all creatures. The graphics and music are well done. The music may be in the loop but it’s not so bad at all.