Okay here are two games I haven't played or even thought about in years. Two games that were frustrating yet rewarding, two games with sequels [of sorts] that I never got around to checking out...
ANOTHER WORLD [aka OUT OF THIS WORLD]
http://en.wikipedia.org/wiki/Another_World_%28video_game%29
http://www.youtube.com/watch?v=dNeayv-OTK0&feature=related
http://www.youtube.com/watch?v=LIR-APjbU4o&feature=related
FLASHBACK
http://en.wikipedia.org/wiki/Flashback_%28video_game%29
http://www.youtube.com/watch?v=gJyP5efESaI&feature=related
http://www.youtube.com/watch?v=7AQvgbdtIJk&feature=related