Players start by placing their edge piece on the planet on their side of the board.
They then start building their puzzles as fast as possible with the restriction that every piece they place on the puzzle must connect to one of their pieces which is already on the board. As they expand their puzzles they will complete planets and space stations. Astronauts defend territory by preventing their opponents from playing any piece which would connect to the pice on which the astronaut is sitting. Rockets and satellites allow the players to connect pieces to their opponent's puzzle instead of their own. Play continues until the entire puzzle is completed.