Stormonu
NeoGrognard
Yes, it has a condensed rule book covering the basics of play. There's no character generation or advancement rules as your expected to use the included pre-gens (which are prebuilt out for level 1, 2 and 3). But it comes with a small selection of monsters (on cards) and the adventures hand-hold the DM through running the game.It tells you how to play and you can play it without the core books?
If you want to play beyond the included adventures, you'd need to pick up the core books. But if you're not bothered with advancing the characters any further past 3rd level, you could make up some of your own adventures to squeeze more out of the boxed set if you wanted to.
But it's really designed that once you play through the four enclosed adventures that by that time you should pick up the core books at that point to continue on.
An element I miss from the old B/X and BECMI set was that there was enough there you could stop anywhere on the way and had enough material just in those sets for endless hours of play (as long as the DM was willing to make/buy more adventures). This set is more geared toward introducing and teaching the game than being a "complete" subset of the early game.