Thanks for the tutorial link, Noren. Yes, Klunk, may be you are right and they definitely used higher version originally or reduced them specifically for the game, but taking into account icon size this wont make significant difference imho.
Many thanks for the answers. I thought about toon shader too, but wasnt sure. Also thought about cel shading, but i suppose thats a bit different story, right? Can i ask you to give me a few links with some tutorials where described how to make the effects you mentioned. I tried several about toon shading, but they mostly…