Up against no one but yourself, you have to figure out how to leave only one peg on the board. This is enhanced in Jumping Ball with new elements of gameplay.
There are six different game variations. While some of them only relate to scoring, others will make more balls appear when certain things happen.
The game also looks and sounds great. The interface and board are clean, and the audio is unobtrusive. There is a multi-player mode that uses the keyboard in case you want a bigger challenge. The single-player game's difficulty can be adjusted (resulting in a more complex grid) if you, like Charon, have no friends.