Kentucky Route Zero.
This game is a surreal experience. It will stimulate your senses in an unfamiliar way, and leave a lasting affect on you. I immediately desired to relive the story, just to feel everything I had JUST finished feeling. It's a journey I'd highly suggest everyone give themself the pleasure of taking. If you're reading this and haven't played KRZ, I know it may sound silly, but I envy you. The adventure that awaits you is a special one. Lights off, headphones in, and give KRZ your undivided attention... play it in order including interludes, and play it at your own pace.