Matt and his girlfriend Jenny, two parapsychology students, decide to visit Dr. Jant's home, a mysterious scientist who disappeared years before he was in the field. A violent thunderstorm takes them unprepared and forces them to find shelter in the abandoned building; inside the darkness is total, and "something" takes Jenny to abduct and trample Matt. The young man awakens after some time, and with great surprise finds that a mask has been put on his face: the "Terror Mask" of which Dr. Jant spoke in his notes, an ancient Aztec sacrificial mask. Matt realizes that the only way to save his girlfriend is to trust in the malignant powers of the mask.
The game is a sliding shotgun where Matt has to cross seven levels that include the various parts of Dr. Jant and some sections outside. Matt can kill, with great bloodshed, the various monsters that he encounters with kicks, punches, some special moves such as the slip and especially the weapons spread out here and there that make the enemy's flesh worse.