If you got stuck on some difficult level in Worm Plex I have a good news for you. I will be posting youtube videos with walkthrough for each level. Each one shows how to complete level and get all three diamonds. So far solutions for first 20 levels are available. More will come soon. Enjoy!
If you ask about beating level 01-031 with three invisible ghost then you must be quick enough. Also keeping close (but not too close) to ghosts can help as they can't become invisible then so you can better plan your moves. And finally there's secret with powerup hidden in the middle. Good luck!