Especially the version on the Xbox360, or, as I call it, "that big white box I own solely to play Perfect Dark on". A straight port with upgraded graphics, better framerate, modern controls, and (or perhaps this one I'm imagining) subtly rebalanced difficulty to account for those other changes. Nothing like that garbage trying-to-be-Call-of-Duty-and-failing-miserably Goldeneye reimagining a few years back.

Still unmatched in terms of gameplay options. Coop single player, versus(!) single player, the great multiplayer of course. The way the difficulty settings changed objectives and even starting location(!) in addition to damage values and AI. The fun "cheats" you unlock with speedruns. Brilliant game.