Hurrah! I’ve managed to beat Level 17 of Challenge Mode. I not only managed it, but I managed it with three worms remaining, one of which never took any damage at all. Ace.
But then 18 went horribly wrong. I’d wiped out all of one team, just misjudged a fireball punch move thing, which put two of my worms on the edge of a cliff, where they were promptly shot off next go. I had a decent stab at clawing my way back, but never managed it.