Lovecraftian Horror with Labyrinth Lord
from the introduction:
This booklet contains some guidelines for running role-playing games of Lovecraftian horror and investigation using the Labyrinth Lord game rules. Many other RPGs exist which provide rules for games with the dark, creeping atmosphere and eldritch investigation typified by Lovecraft's writings, but the rules in this booklet are designed for referees who wish to run such a game using the solid and familiar foundation of Labyrinth Lord .
Primarily only the rules for character creation and advancement are modified, as many of the tropes of character advancement in fantasy adventure games are antithetical to a Lovecraftian setting. Some additional more detailed rules for injury, horror, sanity and magic are also provided, to emphasise the atmosphere of a Lovecraft-inspired setting.