Light'Em Up is a 1st person horror game with a story that unravels level by level. The character you play only survived an attack by an undead thanks to the help of a friend. Since then, he has been sending medicine to suppress the illness.

At the beginning, you are in your garage. You have no memory of the last few days. This happens when you don't get enough medicine. You send a letter to your friend to get some more. He sends you packages with medicine, mirrors, weapons and information. To kill the undead, from whose flesh he makes medicine for you. You load your pickup with the mirrors and choose your weapon.

In over 15 levels, you first set up the mirrors in the puzzle phase and align them so that the sunlight shines deep into the hiding places. Then, in the hunting phase, you go inside the hiding places and lure the monsters into the light of the mirrors or kill them in melee combat. Don't let them catch you, otherwise your illness will get worse and you'll need more medicine.

Back in the garage, you send the undead flesh to your friend to get more medicine and write to him what's on your mind.

You learn from your diary that there once was someone you loved...