I tried to do this once. I decided i'd start a game and not play another one till i finished. I think I managed like 3 games. Tbh i have over well over 100 games i've not even played before on steam alone, also got shitloads of vita, ps3 and 360 games i've never finished or played either as well as many more PC games not on steam. I've actually been staying away from the PC recently cus I usually play multiplayer games on it atm like hearthstone or h1z1 or other time sinks like total war so for now i'm focusing on finishing all the PS4 games I've bought then i'll go back from there :P