How the heck did you pass the grenades part? I’ve tried like 15 times already and can't find a consistent way for the worms to get out of the ground.
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You have to, SOMEHOW, run and don't be eaten, climb a rock or something or run in circles (what I did) after a lot os tries, the Worm appears, you have to throw exactly to the mouth and after a few seconds they die. But hey, being honest, I kill the first worm like 3 times, I died those 3 times and I quit.