is that easy to improve your level by only playing

I guess it depends on your starting level. Playing and analyzing your own games is rocket fuel for a beginner/intermediate player.

You have to study. Playing alone can only take you so far. My ex used to have a huge problem with this. She played a lot of games but didn't really improve much. I used to try to encourage her when she did show signs of improvement and get her to build on it by trying to get her to study those areas where she was still lagging behind but she couldn't be bothered so any progress she made was always very slow and it frustrated her and me because I knew she could be a lot better. She used to think I was better than her because I had more talent for chess than she did, but I studied damn hard to get to where I am, even though that isn't all too impressive. I used to tell her that there are many others a lot better than I am because they had more time to devote to studying the game but it never really sunk in, sadly.

Wise words.... Talent has a role to play too, of course. I myself became world champion 27 times and the only thing I studied was the label on my bottle of tequila...

I think better to studying everything to save your time

i am a living example (so its 100% true): NO!!

I love chess to bits and play it as often as I can, but I hardly record and never analyse, I don't have a chess program, see? AND, I've gone nowhere. It works only if you're a complete beginner and pattern recognition will help you a little, but otherwise, if there's no analysis and studying, 100% NO, you won't get far even if you do.

observing good players games might improve you too...

Depends who you are playing.  Seems to me if your always playing a stronger opponent it's got to help your game, even if he/she isn't that much stronger. 

I have never studided chess, I'm not a great player but you can get to at least my (relativly low) level without studying

Chess isn't on TV in my country but the one time I saw a match televised (Kasparov Vs Short) I picked up a lot of stuff listening to the guys commentating on the game.  Not just about the game in question, also some of the history. 

I just keep my ears open when in the company of other chess players and then look up anything that intrigues me. I was 2150 OTB by the age of 19 with no formal study whatsoever.

 

p.s. I was playing skittles/blitz with masters and near masters at least 4 times a week for most of my youth (13-19 years old).