[General Discussion] Games you consider "Perfect"?

Super Metroid. The game definitely creates a wonderful atmosphere, probably the first game I ever played to give the feel of an atmosphere while playing it. The world seems massive, but it is easy enough to traverse the entire planet quickly. There's a ton of hidden stuff to find, and several different ways of going through the game. In fact, the glitches in the game add to the gameplay, rather than breaking it, creating even more paths through the game and different ways to find items.

Tetris Attack is close (even has good AI, of varying levels), and Tetris for the Game Boy is also close, but it could do with more gameplay options. I haven't tried Tetris for the DS, but if the control is like the Game Boy version, it has a shot.

Jam it back in, in the dark.