Cosmic Tunnels

You are the principle defender of the planet Sirref, the only habitable planet in the Relffok Galaxy, which is part of the Nodrog universe, and you have a major problem, the energy supplies are running dangerously low. The Jebs have forced a energy embargo on your planet and won't supply the Power Generating Complex situated on the moon which supplies all the energy for the planet from their power plants located on four asteroids. You have decided that your mission will be to get the energy bars needed from the asteroids, but the only way to get there is through four Cosmic Tunnels and if you are successful then you have to land on each asteroids and collect all the bars that they have before returning back to your base.