Sticky Grenade

The gel stops it bouncing. Whatever surface it touches first is where it stays until the fuse runs out, which turns it into something you place rather than something you aim. Drop a few onto a corridor floor ahead of a spawn wave and let the enemies walk onto them.

• Worms take it well. The blast covers several segments at once and a burrowing enemy cannot dodge a stationary charge.
• Eater of Worlds in Expert is the exception. It shrugs off most thrown explosive damage, and its segments are long enough that any single blast reaches fewer of them.
• It will go off on you as readily as on anything else. Stuck to the wall beside you is not a safe place to stand.

The tooltip implies you can throw it further than a plain grenade. You cannot. The range is about the same.