Wizardry is one of the true classics. It comes from a time when RPG meant simply fighting your way through a maze, with some few puzzles and such along the way, but primarily focused on gaining levels through combat. The features we now think of, e.g. overland travel, NPC interaction, etc., were considered the realm of Adventure Gaming. So we have a very simple plot in which an evil wizard has stolen an incredibly powerful artifact and hidden with it in a huge labyrinth beneath the Overlord's city. Your job is to fight your way to the bottom level, destroy him and recover the stolen item. To do this you will create a party of up to six characters of different types (loosely based on D&D rules) who will then fight, cast, and sneak their way through the maze, picking up treasure and experience along the way. Of course it seems quite simple by today's standards, but it is still an extremely fun game, and one of the must-plays if you are an RPG gamer.