Personally I usually have a 30% on average of quitting a game because I realized at some point that I can't make any progress on my own. Only during 2013 I had to quit many games for this cause, like Portal 2, Mirror's Edge (later I finished it consulting a guide all the time, but it doesn't count really), Apache Air Assault, Metal Gear Rising, and Remember Me. I play games for over than 20 years, I have memories from old school 8-bit games too, I'm not new to video games, but still I often find myself struggling to beat a game. I have beaten genuinely hard games like Castlevania: Dracula X Chronicles, but I almost lost my mind in the process, so I'm not going to try that again. So what about you? Generally do you have a hard time to beat an action, or a platform game, or difficulty is no longer a serious problem for you after years of experience?