What makes a game truly great? Is it the mechanics? The art? The overall aesthetic? Perhaps a combination of all of these traits, fused with a certain undefinable something that stirs up a passion within our hearts and a desire to keep playing. From 16-bit retro to 3D RPG epics, here's a list of games you absolutely need to play before you die. Whether you're into dark explorations of the unknown or lighthearted romps through wild and crazy wonderlands, this list has something for you.