If you fly into the first end of level baddie when its jaws opens up, avoiding its fire and being careful not to touch it, you will be presented with a version of Space Invaders. Complete one wave and you will be given three extra lives and be thrown back into the fray.
When you die, pilot your flashing ship down below the score at the bottom of the screen to have a free tunnel of aliens.
When you get to the guardian, stay at the very top right of the screen. It can never reach you, and you can kill it with homingmissiles without moving.
Always select the Crux II battle ship. Although it's quite slow and has heavy inertia it packs a hard punch and starts off with enough weaponry to ensure your ship soon becomes able to deal with stronger enemies.
Don't use Speed power-ups on the Crux II until you've nearly powered up your craft completely, otherwise the inertia is unbearable.
Power up your Plasma as soon as possible - you can power it up to eight times. Once it's powered up five times it becomes very effective.
Don't be tempted by the Laser or Magma weapons, they aren't as good for general blasting.
Pack as many homing missiles on as you can, up to a maximum of four. These are effective when there's lots of enemies on screen.
Power up the Build-Up weapon, and press 'A'. This enables you to hold the fire button down and build up a massive laser, which is useful against end of level nasties (e.g. the nasty on level one can be destroyed with just one shot). Go back to autofire by pressing 'A'.
Always play in Arcade mode if you want to progress further than level 2!
Always keep your craft in the middle of the screen towards the left side. This way you will always be aware of things approaching you.
Don't be greedy! There are more than enough power-ups available.
When killed, your weapon strengths decrease by 25%, so if you collect two homing missiles you will be left with one.
It pays to dodge some enemies rather than fight to destroy them all.
When you reach the end of level two baddie, quickly fly into the top right corner of the screen and stay there. Now if you're powered up with homing missiles you can safely fire then at him until he dies. Obviously the more missiles you have the quicker he'll die. I don't know if you can perform this little trick in the special edition of the game.
It was alleged that upon reaching the first end of level baddie, and flying through it's open jaws, would transport you to a bonus stage from which you could gain some extra lives. Well unfortunately it's not true. This tip was printed by Amiga Action, whose purpose was to see how many other Amiga magazines would copy from their own. Quite a few did as well!
It's also been said that on level 2, just after you die, when your craft is flashing, quickly fly down under the scenery and you'll find yourself in an enemy free tunnel for the rest of the level. Well it's true that you might not encounter any enemies down there but you will find a few rocks, thus loosing some lives.