Continue game play...
	Fortress Tip...
	Tank Missile Tip...

Hold Down/Right and press 2 at the game over screen.

When approaching the end of level fortress, move up to either top corner and hover there. The fortress should now blow up without you touching it.

In the second half of stage one (the city) you can dodge the tanks' missiles by moving in an anti-clockwise square around the edge of the screen.