You're getting exactly what you see here. Caverns of Chaos is a very fun tribute to the classic D&D module. You get large scale section maps that can be pieced together to form a single map. Or, you can work from a smaller overview map.
Two bucks is what it costs you to be able to plunk down this classic dungeon crawl tonight. Sprinkle with monsters and you've got a game. Caverns of Chaos is another example of what gamers love about 0one games.