The 4C System -- including both Basic and Advanced rules -- is a public domain work inspired by a classic superhero roleplaying game. This complete RPG system can be used as presented or as the basis for an RPG of your own creation.
NB: The system book available from Lulu is missing the Master Table (which is required for task resolution). 4C is also available from other sources with the missing Master Chart included. A 'Streamlined Master Table' is also available separately.