Knockumbones

From the introduction:

You used to be alive, and that really sucked; but now you’re dead so congratulations!

You’ve been drafted into this year's Skeleton War by the great and powerful Necromancer. For one day each year you and all your skeleton buddies get to leave the crypt to recruit more to your cause. Good luck, and knock ‘em dead!
...
You are tasked with going out into the world and killing as many meatbags as you can before the day is over. The player with the most kills at the end of the game is declared the winner.