You command the blue fleet. Red, green and gold fleets are independent computer opponents. Later missions include all four factions. Select a blue planet, then tap a target to send its ships. Drag a box to select planets or ships. Send ships into open space to hold position, then select them again to regroup or attack. On touch screens, pinch to zoom and move two fingers to pan. Use Overview to see the whole battlefield. Escape clears selection; Space pauses.

Send ships into your own planet to repair it first, then upgrade it. Owned stars also repair slowly: after 20 seconds without enemy arrivals, recovery adds 1 HP every 10 seconds. The first HP returns after 30 seconds. Ship repairs are immediate on arrival. Medium costs 24 ships; Giant costs another 48. Most neutral stars have only one circle and always produce one ship per pulse. Empty circles show each star’s maximum size. A small bar below the star shows upgrade progress. The star grows only when the upgrade is complete. Stars with only two circles cannot become Giants. Larger planets produce more ships per pulse. Gray planets are neutral. Neutral stars stay gray while a small bar shows your capture progress: 24 for a small star, 48 for medium and 72 for a giant. Production starts only after full capture. Rival ships cancel capture progress one for one. Destroyed stars become small neutral stars and require 24 new ships to capture.

Win by destroying the last planet of every opponent. When a faction loses its last star, its ships stop and can no longer capture planets. They remain in space and are destroyed one for one on contact with rival ships. Each faction has the same fleet limit: 1,000 ships on desktop or 500 on touch devices. Production resumes when losses or investments free capacity. There is no time limit or score ranking. Play at your own pace.