We've got two giant-killer-worm games for you to consider today, each available cheap for an iPhone/iPod/iPad. Death Worm is based on the 2007 original of the same name. Super Mega Worm Vs. Santa is a newer elf-slaying take. Decisions, decisions.
Both games went on sale in the iTunes store in recent weeks. Death Worm has a free Lite version, so try that first. The Lite version is ad-supported and only includes an endless mode. Super Mega Worm Vs. Santa and the full version of Death Worm each have more levels and cost 99 cents.
Take your pick.