I'm stuck on the 4th mission (Yes, It seems I'm a retard) It's the one will you fill the cannon with shells by picking up health boxes. Once you fill it up enough, you jump down into the firing pit and launch them. Thing is, once you fall into the pit, you can't get out. Any help/Advice?

http://wwp.team17.com/main.html?page=info&area=_walk_sing1&type=uk

sorry to re-open a thread that old but I have exactly the same problem. I read the official walkthrough but it doesn't give any clues that could help.
4: Shell Shock
The aim of this mission is to destroy each of the three Worms on the neighbouring island. You can do this by collecting the health crates. Each time you collect a health crate a special charge is placed in the war-boat, and you need to judge through trial and error how many crates you need to collect before dropping into the seat and firing these across at the enemy. The problem is that your own Worm can get blown out of the boat and into the water by the blast. You can remedy this problem by opening your weapons inventory and placing a girder above the boat to keep you in. When you place the girder make sure to leave a gap so you can get back out, don't trap yourself in! Once you've done this you'll need to collect six crates to kill the first Worm, seven to kill the second and eight to kill the third and final Worm. Good luck!
If anyone could help I'll be gratefull. :P It's getting frustrating :rolleyes:

Backflip should be your best buddy. You can look for it in Wormopedia VARIOUS JUMPS

sorry to re-open a thread that old but I have exactly the same problem. I read the official walkthrough but it doesn't give any clues that could help.

If anyone could help I'll be gratefull. :P It's getting frustrating :rolleyes:
Well, what part are you having difficulty on?

backflip jump ofc! doh ! :o I completely forgot about jump button2 .. that explains quite a lot :D thanks marx ;)