Don't worry, you won't need a retina display to play this game. Stealth Bastard is a retro platformer in the finest tradition of pixelated gaming, so it won't task your system too much, and it's also completely and utterly free, so your wallet won't be bothered either. Developed by Curve Studios, this game features a whole heap of treacherous levels, which come with leaderboards for recording the fastest shadow stalker out there, and once you're done with those, there's even a built-in level editor. Those levels can then be shared online, meaning that even if you can't be bothered to create something new, others likely will, further extending the remarkable value for money of this game. Sadly, Stealth Bastard is only available for Windows at the moment, so Mac users might have to sit this one out. Get it at the source link below.