Players compete to gain wealth by buying and selling the moons of Jupiter, Saturn, Uranus and Neptune, and by changing moons' values by improving (or possibly blowing up) the orbital facilities of their planets.
Each player starts with 24 money ($).
There is a moon queue of 10 randomly dealt moon cards.
Each planet has no orbital facilities.
Each planet has a different task die, rolled at setup. Jupiter D12, Saturn D10, Uranus D6, Neptune D4.
The player may reroll any one task die if they wish.
The player may buy a moon from the moon queue. The one at the front costs $5, and each one beyond that costs $1 more than the previous. If one is bought, add a new random one to the end of the queue and move others up in the obvious way.
The player may carry out the task defined by one task die. This requires as many moons plus facilities as the die number. The moons used must be owned by the active player, but the facilities can be other players'. The active player can hire any facilities by paying the owner $1 rent, which the owner cannot refuse.
Completion of a task gains the active player a new facility if the task die number is higher than the number of facilites already there. If not, then the planets' moons instead pay $1 each as income to their owner.
Game ends when the last moon is bought. Players score for their moons, each worth the number of facilities (regardless of owner) at its planet.