On the equipment screen, select the white bug-shaped ship and put it in the grid area. Choose the single orange-colored laser, drag it up to the face of the shop owner and keep clicking on the 'Left' mouse button and you'll get 500,000 credits.

Insert the disk, and hold both mouse buttons until the title screen appears. When you're in the shop hold down 'Help' and 'Del' for a few seconds, now choose your ships as normal, but you have infinite energy.

To get more cash at the beginning of the game, select the smallest ship (the one at the top), then the weakest laser (the orange one with single beam), and place it on the shopkeeper's nose. Hit the 'Fire' button to get the cash boost!

When you are confronted by the first end of level guardian, shoot off the bottom hooter (the one closest to the skull), then position yourself so that you are not shooting the last hooter (the top one). Make sure you are only shooting the bubbles that he fires at you. This should give you approximately twenty credits per second. This takes ages, but if you are persistent...

In actual fact you can have twelve different ships. All you do is press 'F1' for the first ship fully decked with weapons. Pressing 'F2' for the second ship and so on. After a while you won't get any more ships because you'll run out of money.

The last ship with the bottom three way laser and two non-moving satellites, placed either side of the ship is the best ship that will last the longest. Add the arc satellite, sprite bomb, and bouncing bombs as soon as possible. It's also very advisable in the later levels to get the shield.

Choose any of the four ships in the shop. Click the ship as usual onto the blue print screen and then choose the invincible icon (the one below the laser and to the right of the orange spiked ball). Now drag this icon to your ship and click it on and off of the ship. Your money increases by 500 units. Drag the icon to the Alien Trash Can and trash it. Carry on doing this to boost your money to your heart's content.