The 1985 original: the real 91-space board, real deed prices and rents, gravity wells, orbital branch paths, Red Shift cards, and the hydron fuel economy.
Start with $1,995, a full 25-hydron tank, and 3 fuel stations. $500 for passing Earth, $1,000 for landing there. Fuel burns only when leaving a planet or moon — one hydron per pip. Doubles draw a Red Shift card instead of moving. Rents climb steeply as one player collects a planetary system. Last ship flying wins.