From the Invisible City website: A dance with Jovian moons for 1 to 4 players During the last leg of an astral race to Neptune and back, you and your competitors were caught in a cosmic storm near Jupiter. Banding together you survived the storm, but it sapped almost all of your psychic energy. Now you must harness and store energy created by lunar confluences to build up enough power to return to Earth and win the race. Object: To accumulate 16 or more Psi by riding on a satellite that begins a line of three or more satellites. Download here: http://www.invisible-city.com/play/94/jovian-syzygy