Effing Worms – Xmas

How does the game Effing Worms – Xmas work?

One of the bloodiest games that's ever existed is back! Christmas is coming and this worm is so hungry that he doesn't know if he'll live to see the day. Why don't we give him some help? He's headed straight for Santa Claus's house where the little elves are making the presents... greet them properly!