GFingerPoken is a BlackBox-type game written in C with graphics in POV-Ray. It uses GTK+ 1.2 or higher and is based on an old MS Windows shareware game called Marble. It features an easy drag-and-drop interface and randomly-generated levels with adjustable difficulty. It now features network play with two different game types. It is currently fully playable, but is still a little rough around the edges.
