Monster Mansion is a print-and-play game in which players try to escape from the mansion before time runs out. This is the “mini” version to entice you to participate in their Kickstarter, and eventually, to purchase the retail version.
horror
Lamentations of the Flame Princess RPG
Lamentations of the Flame Princess is an old school RPG of “fantasy adventure and horror.” The link is to the free version without illustrations. The illustrated version apparently has some rather adult and disturbing illustrations.
Shaun of the Dead Card Game
Shaun of the Dead is free card game based on the very funny movie of the same name.
Reanimation Zombie Survival Card Game
Reanimation is very highly rated at Board Game Geek. And it is free.
Dice of the Living Dead
Dice of The Living Dead is a free print-and-play zombie survival horror game.