Getting back into Metal Gear Solid Peace Walker. I'm about at the end of the game and I've really enjoyed playing a portable full on stealth game. Its scope is quite limited, what with it being a PSP game, but it actually serves to breed a pretty easygoing stealth game with not too much of a cost for getting caught and pretty limited sound and sight ranges to match the small level sections.
While it's totally limited it's actually a bit refreshing compared to how tight being stealthy can be in even the home console MGS games.