Ah, I remember that one particular round when I have to use Invisibility on my last worm. It only works on the internet as a utility that is powerful, but also turns you into the Dark Side. While activated, all your worms on your team will be left with just an outline that only you can still see, but everyone else will see nothing. Be aware that the game camera still follows your exact position when it is your turn, especially if there are users running a low resolution, and any crates you pick up, touch a mine, hitting an oil drum or drown leaves a trail for all your opponents to see.
This powerful utility does not end your turn and can last for one whole round, perfect for making last-minute getaways to make a drastic comeback on even expert players. However, as soon as you use a damaging weapon (the prod is the only exception), or take damage by any means whatsoever, invisibility will instantly wear off, making your team visible once more.