The perfect game for you would be....

[Carnagath]

The perfect game for me would be a potential Dungeon Keeper 3 with a 100 hour long single player campaign with maps with the depth, size and level of brilliance of some in the Deeper Dungeons expansion for DK1, and a faster, tighter pace that would permit some serious competitive online play. Oh, and controllable horned reapers again, not like the DK2 fiasco.

 

[FightThePower]

It's already been invented, and it's called Metroid Prime. It's not a perfect game, but it's perfect for me at least.

 

[SquirrelPants]

Fallout 3 gets pretty close...But my BEST idea of a game would be a stealth game in which you absolutely cannot kill guards. If a guard goes missing from being knocked out, people notice. An explosion plus a giant hole in the wall warrants a bunch of extra guards, and an ongoing search for your character rather than "What was that noise?!"

And, instead of ending with a bad action sequence as good stealth games often do, it would be an amazing plot point of some sort, preceded by a very intense stealth section.

(Also the game would be very story-oriented.)

 

[esperandote]

scary, great story, good gameplay, lots of replay value, multiple endings, great sound effects and soundtrack, well define characters, very deep psychologicaly speaking.