Curing the undead is a pretty simple process at first glance. Click and hold on Viro, then pull back to select the angle and power of your shot. When you release the button, Viro will go flying. Any healthy creatures he comes in contact with will become "infected", and you need to infect them all to pass each level. An infected creature will transmit the disease to any healthy monsters it touches, but if two infected touch, they cure each other. You only have a certain number of shots to pull this off. There are 120 levels to hone your monster-mashing skills in, along with a special challenge mode, and a level editor to create your own challenges.
120 levels is a lot. Like, a lot. I almost feel as though Vampire Fever could have been half as long, and been better for it. A large chunk of the levels feel like unnecessary padding, and you can go quite a while before you see a new creature or obstacle to change things up. And while some of the those creatures do force you to think strategically, inevitably most of us will probably fall back on that old stand-by "wildly firing off in every direction and hoping for the best". Still, the game is undeniably charming and clever, with a unique take on the game of pool that will definitely test both your skills, and your skillz. If the adorable aesthetic and quirky presentation woos you, you'll probably enjoy every victory as you conquer that massive edifice of physics/puzzle goodness. Just hope you like pink.