Yes it is a gun limited ammo but very effective.
I've made it back on top of the islands, managed to minipulate to get on the back of the blue bird, now riding to the teleporter.
Arrived down at the teleporter, back with those monsters in the previous chapters. almost finished

Your getting there. The gun, maybe an Egon or Gauss. Have fun and good luck.

Hi again, well I'm almost at the end, I've made it to the little fat boy, used the bouncer to get up a little higher, try to land on his head but no luck, now trying to use bouncers on the floor, i can land on his head, it opens up and I immediately get killed.
Any ideas/

Your almost there, Shaggy.

To get him you need to destroy the orange crystals. I think there are 3 or 4 of them. If you have enough rockets, use them. A couple of shots should do it. If you don't have any rockets use any heavy weapon you've got. When his energy disappears use the trampolines to get up to his head and fire into his brain, again the rocket is very effective. When the brain is destroyed, you've won.

Also, you know those things he projects, try the Hornet Gun to get rid of them and use some cover behind a rock, or spirals. He may catch you and transport you to other areas, a real pain, but just fight the monsters, and use the trampolines to get back to him.

Thks, will give it a try

Hi again, well I'm about ready to give up, I've tried at least a thousand times to kill this thing, I was able to destroy the 4 yellow spikes on the walls, I thought this was to remove his power, he still kills me.
I try using all of the platforms on the ground to bounce up, I notice his head opens up, but that;s about all I can do, I've tried to land on his head, no success.
Any ideas?

Not a one. The only thing I can suggest is keep trying and you'll do it. It took me forever and a day. Another level I hated, along with the Outer Space and Residue Processing.

Keep trying Shaggy, your so close.

Hi, since my last msg, I've managed to get on top of his head, fire a few shots into the brain, but, eventually I fall into the brain and die>
Total frustration

That's good, not the falling part, but you did get up there. By any chance did you do a save when you reached the top?

Keep at it.

Hi, well I think that's it, I quit, totally frustrated. His head is open, I bounce up, I'm above his head so, I've tried double barrel shotgun into the brain, or crossbow into the brain, even landed right inside, but as always he kills me.
Anyways, thanks for all your help I did manage to get to the END, but could not KILL him.

As for your OpenGL woes if you're using the latest or very recent version of nVidia's Forceware driver then OpenGL support is quirky at best. Try intalling one of their older drivers and that should help.

Sounds like you need some better weapons. Is that all you had left? It is possible to shoot him from down below, I believe.

That's a shame, Shaggy. I've read where some players didn't seem to have too much of a problem with him; on the other hand, there were many who did. I was certainly one of them. As I said, it took many tries before I got him only by the skin of my teeth.

I walked away from it several times. Then after a day or so went back and tried it again ... finally got the so-and-so. I suggest you do the same, give it a rest, and then try again.

How about grenades, do you have any?

Hi, Yes your probably right, I should give it a rest.
I did check and tried grenades, I have 7 left, no luck, I still try double barrel shotgun, no luck,
I also previously when he sent me to the other room, I made my way back up to the top, picking up, lots of health and ammo, then sat behind cover and used all my various ammunition etc from below, no success, so I'll just quit for a few days.
If I ever do manage to kill the bugger, I will let you know.

You could always use the cheats to get a more powerful weapon.