Metroid Prime
Found my way into the Hydra labs and acquired a super missile. I'm glad I gave this game another try. Even after recently finishing Bioshock I'm enjoying this old gem a lot more. My hat is off to Retro Studios. They really brought Metroid into the third dimension. I haven't played a Metroid game since ~1991 and then it was the original on NES. Playing this game feels fresh and nostalgic at the same time as most of the trade marks are intact.
*edit*
Just died a second time after defeating that mass of levitating rocks. Those sentry droids (on my way back to a save point) are proving to be more difficult than that rock boss