Fly your space-ship to collect gems or land on the green planetoid. Use the mouse to point in the desired direction and click to thrust. A planet’s gravity will pull you in, so be careful. Successful landings are a) gentle and b) upright. When landing, warnings are given on approach to the target outside tolerances, the audible alarms can be switched off independently with the buttons in the lower right. Fine-grained control of sound effects and music can be made in the settings screen. Also in settings are options for graphical effects. Extra life for each completed mission.