realMyst - it's the original Myst storyline, updated with visual bells and whistles (smoother transitions, more animations). That game blew my mind back in the day, but I guess I've been spoiled since then or my attention span is decreasing. I'm not sure I'll be entertained enough to finish the game.
I love the Myst games, I still have all the original discs, bought myself Myst and Riven for the iPod recently.
At the moment, playing Sonic Generations (3DS/PC)