From the publisher's website:
'Swords & Wizardry is an OGL "retro-clone" of the original fantasy roleplaying game created by Gary Gygax and Dave Arneson. The Core Rules also contain some selected material from the supplements (1974-1978). With a thriving internet community and tons of support products, Swords & Wizardry is bringing back a lost style of fantasy roleplaying. Forget huge rulebooks - just play. If you can imagine it, you can do it in Swords & Wizardry. The rules are simple and quick to learn, and they are infinitely flexible and expandable. Take the basic framework and "Imagine the hell out of it!"'
This game, along with several others, represent a special class of RPG called a "Retro-Clone". The other RPGs that fall into this category are:
For those situations which can otherwise hold a game up.....DemoRef. I devised this for B-17: Queen of the Skies, originally (a solo game!). Now modified for Swords and Wizardry. The GM's word is still final: it's just a way of involving players more. Just a thought.