for the very last parts of the game you need to by flying as far forward as you can. then when you need to move up or down you have to do a backwards diagonal. There are plenty of videos online showing how to beat scramble. 

https://www.youtube.com/watch?v=m-PDf1Su6gA#t=201

This.

Once you master this (which is fairly straightforward), the last part of the game becomes the easiest in my opinion.

From this point onwards, the game doesn't really get any more difficult - just make sure you try to keep your fuel topped up by bombing as many fuel silos as you can!

Hi all

Long time fan of John's videos. Never realised there was a forum until recently, so here I am!

I'm relatively new to the hobby (2½ years) and have a very modest collection of PCBs and machines including a Taito Space Invaders Part II, Atari Asteroids cabaret, Sega/Gremlin Astro Blaster mini and generic (UK 'Electrocoin') JAMMA cab.

Looking forward to being part of the community here.