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A small video of a marble track using the lift extension demonstrates what can be done with GraviTrax®. New balls emerge from the lift in the lower left corner whenever the lift button is pressed. The build instruction for this track is among other files of run descriptions in the wf_lift file. These descriptions can be stored in a sqlite database and a human readable description can be generated using the program gravi contained in the perl package Game-MarbleRun. The program can also produce simple graphics like for the lift example showing the complete track and the elements on the ground plane only.
A detailed description in german and a less detailed english description of a compact notation for marble tracks is available. A quick reference card in English and in German is also included in the package. A list of Changes shows the development history of this package.