Not sure what 'low end' is for you but if you like puzzle games, The Talos Principle (2014) is fairly low end (plays great on my 6 year old PC) and can be completed in about 6-8 hours. Though, because it's a puzzle game, it could take much longer than that. Right now it Is $4.49US ($9.98US for the gold edition) on Steam. Puzzle logic is similar to Portal.