The original Bionic Commando for the NES is something that will always stand out in my mind. It was the first game that really instilled the concept for me of playing within the rules of a game. Instead of hating game play for lacking something (like for example the ability to jump). I began understanding why a decision like that would be made in your standard platformer, and began to wrap my head around the concept of a standard platformer now incorporating puzzle-based strategy. Getting from platform 1 to platform 2 was no longer just getting the distance on a jump correctly but being able to 'Spider-man' your way over to it without the benefit of a leap.