To play this map, simply click 'subscribe', then enable custom maps in-game.
Why maps 'like this' are popular - (1) Are they? I've personally never seen much maps like these. most maps, in my experience, are rather big and convoluted. (2) If they are, I suppose a relevant amount of people like them? I can't tell if you're genuinenly wondering how the popularity system of steam works, or if you don't like this particular kind of map, that just happens to be popular.

how can play this map in the game¿?

Why are maps like this popular?