If you mean by # of copies distributed, it would probably be Call of Duty: Modern Warfare (as of 2011.)
Yes, the term 'video game' is a common noun, made up of the common noun video, a noun acting as an adjective in this context, and the common noun game. A proper noun would be the name of a specific video game.
The most common place to trade in PSP games is Gamestop, which accepts trades and has a wide selection of games for you to choose from.
The most common support used for a video camera is a tripod.
There is none, it just depends on the game.
The Nintendo 3DS is, by very far, the most beautiful video game ever. Both as in the physical video game itself, and as in graphics.
HDMI cables are used to run high definition pictures on a television or a computer monitor. The most common use is hooking them up to a video game console.
To many critics and video game entrepreneurs, the most shocking moment in video game history was when Sephiroth killed Aerith/Aeris in the video game Final Fantasy VII.
Forza Motorsport 5 has the most licensed cars available in any video game.
The Jesus of the video game makes the most money, silly.
The most points scored in a NFL video game is 105 points.
There is no common operating system amongst video game consoles. Each uses their own operating system developed in-house by the manufacturer.
Most critics praise the graphics and art direction, as well as the innovative gameplay. Another common area in praise is the game's soundtrack. IGN.com also praised the ending to the game, which I have to say, is the best video game ending I ever saw!