This will probably sound as a stupid question to all of you, but I'm just new to the game. My question is: how do I get special weapons such as the Earthquake, the Scales of Justice, the Indian Nuclear Test, the Ming Vase...

I mean, I'd really love to have a weapon menu such as this:

http://upload.wikimedia.org/wikipedia/en/9/90/Worms_weapons_and_tools_menu.png

While I have only about a half of the weapons in it.
Thanks in advance to anybody who'll help me!

I went on to this webpage:
http://www.geocities.com/final_onslaught/goodies.html

...download the 'Full Wormage' half way down the screen.

then follow the instructions nect to the weapon inventry picture. ::)

Normally, you would unlock that scheme by getting gold on all deathmatches and training, and completing all the missions.

Thanks to both of you guys! ;)

You'll also want to make sure you're playing on an island [rather than a cavern] map, that you have more than one worm and that you're playing online. Unless all of those criteria are met, you'll be missing air strike weapons, Worm Select and Invisibility, respectively, from the weapons panel.

My suggestion would be to unlock the Full Wormage scheme and the additional cheat options by completing the game rather than messing around with unlockers. But even if you want everything unlocked overnight, there's a much more simple way of getting it done. Have a look at the TeamED utility at the following address:

http://www.rrkit.com/utilities.php

Also, if you have indestructible terrain activated, you'll miss the Concrete Donkey.
The invisibility utility also works in LAN games.

Might be the wrong place to ask about this but anyways...
How do I perform the zook trick while hanging from the ninja rope?

Which zook trick is that? The one where it doesn't explode? I think there's a tutorial on www.worms2d.info

Indeed there is and here it is: http://worms2d.info/Floating_weapon_glitch

Thank you for the reply.
I finaly got it to work.