Which nations have contributed the most to gaming?

[Kantor]

For console gaming:

1) Japan (easy one. While Atari may have been American, Nintendo (who brought gaming back from a crash), Sony (who won two generations), Sega (considered to have the best first party of all time), Capcom, Konami, the list goes on.) EDIT: Square (and Enix I guess). I can't not mention the company who made upwards of 30 Final Fantasy games, Super Mario RPG, the Mana series... also Namco.

2) America (also easy. Atari, Microsoft (Windows, the Xbox), Blizzard, Activision, EA, the list goes on again)

3) The United Kingdom. For all the reasons you mentioned. And Criterion (Burnout), of course.

PC Gaming:

1) America. Not only are both Windows and Mac American, Blizzard are American, Valve are American. Deus Ex and System Shock were both developed in America.

2) The UK. Bullfrog, Lionhead, Creative Assembly, and Eidos (or Square Enix Europe as they are now named, I believe)

3) Nobody. Really, nobody else comes close.

Handheld Gaming:

1) Japan. Nintendo. Sega. Sony. And all the games that came with Nintendo (Pokemon, Zelda, Kirby, Mario, etc.), and many of the Sega ones.

2) Nobody else comes close

3) See above.

So overall, it would still be

1) Japan

2) USA

3) UK

In my opinion.